Roller followers
They are not easy to pop off
You have to get the cam on the base circle and pop them off with a big screwdriver
Many times you will wish you had the right special tool spring compressor to remove them
Do a compression check

 

ahh okay but that was somehow just of a thought of mine because i've seen few f150s but 3V engine that rocker arms poped out due to lack of lubrication...
Because as soon as i started truck once valve cover replacment i coud hear rattle sound but it went away immediately as i squezzed pcv valve hose so it was comming from pcv itself, i will do compression test but engine has been fully rebuild 40k miles ago though, i will try doing KAM reset as mentioned above, maybe it will work i hope.
there is one thing that bothers me also when engine is running on idle and if i squeeze PCV hose on the valve cover it self rpms drop to normal, or is this just a normal working PCV valve? Because once removing oil filler cap shoudnt there be change in rpm if PCV is working correctly because in my case rpm doesnt change?

 

You're right there, anything could have happened
It should not take long for it to re learn idle speed after fixing the vacuum leak
Removing the oil dipstick or cap will make a small change in idle speed just for an instant

 

I thought the roller follower problem was a 3V thing. It's a 2V. 2000 5.4 V8 F150

Squeezing the PCV hose shouldn't cause a change in RPM. It would mean that you have outside air entering the crankcase from somewhere. Squeezing the hose blocks it from the intake system. And if removing the filler cap causes no change it implies that you already have a vaccum leak, I think.

 

Is it possible then that when i squeeze pcv valve hose right at the valve cover it rules out that theres no problem whit vacuum leak between the valve cover to the maf sensor, and more likey theres an issue whit pcv valve or whit poorly valve cover gasket?

 

You should start over with a good clear description of what is happening now. Also, explain the rocker arm situation. Was it completely off, and how did you replace it? Did you examine it to make sure that the roller was not damaged?

Report the codes that you currently have and show the fuel trims, both short and long ,for both banks.

It's too difficult right now to understand what your current problem is.

 

Alright sorry for bad english, let me start over trying to explain what is really going on.
So at first as you know i was replacing right valve cover on the engine because of the broken pcv bracket after inspecting cam and rocker arm when valve cover was off nothing seemed to be damage or out of place that was just my thought that it has to do whit rocker arm because sometimes i overthink to much about things.
Anyway so then when started the truck after rocker cover was replaced including gasket i noticed higher idle in rpms by 200 it sits between 800-900 in neutral or park i didnt bother really at first.
Next morning after going to work again i coud notice a higher rpm in idle and nothing else really so after truck was sitting for a few hours i went for a drive and noticed missifres on low rpm when driving in 4th at 1200rpm and on idle so hooked up a scanner and showed codes as mentioned above in first picture P0153 and P1151 so alright i didnt even bother as both codes are related to one exact same O2 sensor so i went to replace it.
After replacing it next morning again i went to work same thing only higher rpm on idle when going home from work exact same thing as before missfires on lower rpm and these exact same symptoms are present every day.
But now by driving on such a short drives only to work and home as i dont want to cause any damage to the truck no codes poped up yet.
So i did hook up a scanner to do watch live data of all the parameters and i did notice both o2 sensor are stuck lean as you can already see on pictures above so there must have be vacuum leak somewhere so did smoke test and found 2 mild ones i fixed those two and o2 sensors are still stuck lean even when reseting KAM engine is still running rough.
Here are live data parameters of long and short trim fuel i am posting below values were meassured at warmed up engine when idling.
Any ideas im really stuck now in what else to check because im really stuck now i dont know why but i somehow really blame poorly installed valve cover gasket as i applied aditioal silicone between valve cover itself and gasket and waited till next morning so it dried so original gasket didnt fall off when strugling to valve cover in because of such a little space under the hood and maybe engine is getting unmetered air through there as pcv valve is right on top of that cover and as mentioned above whats weird when i squeeze pcv valve hose rpms drop to normal and by removing oil filler cap rpms do not change as they shoud meaning yea that i already have somewhere unmetered air getting into the engine so it this a possible problem thats causing my issue? Anyway please check at photos of parameters and let me know.

 

Your fuel trims don't indicate a vacuum leak. The idle change when squeezing the PCV hose is odd. The O2 codes are a mystery also.

Resetting the KAM as described above might help.

If the PCM is causing the high idle by opening the IAC valve then idle speed should drop if you disconnect the IAC valve. It's easy and will tell you something. If nothing happens then something else is causing the high idle and the PCM can't control it.

 

UPDATE after spending many hours after hours at truck investigating every single thing possible in the end it turned out to be just a bad gas whis is unbelivable 🙄 as soon as i pumped gas at different station it slowly started to run better now its running smooth as before only idle is maybe a little high still 700 when in drive or reverse and 1000rpm when parked or neutral soud it be dirty throttle body or iac?

 

I would replace the fuel filter knowing there was bad gas in the system.
Can't hurt to clean MAF sensor and TB with care and proper cleaners.