hey guys question on my 2001 f150 supercrew 5.4 triton
recently did a tune up plugs,coil packs,filters,belt the whole 9 yards.
the truck starts fine accelerates great and cruises down the road great without missing a beat.
But every now and then when you stop at a light or park it begins to idle down to the point where it almost stalls.When it does this i usually stab the throttle and it revs right up without missing a beat and idles fine for a a while then same thing all over again.
Could this be the idle air control?
seems like something simple due to the fact it runs down the road and accelerates like a big dog.
any help is appreciated

 

I would say yes, although it appears to mostly be working. That means you can take it off and clean it up real good on the inside with carb cleaner instead of buying a new one.

 

I'm having a similar issue...

2001 Super crew 5.4. Seems like everytime I crank it up it idles fine, I ease down the driveway our out of the parking lot and when I drop back to idle it kind of "shutters" and rpms bounce around 500. I give it a little gas 1500rpm or so and it clears right up. Most of the time it is only the first time it comes back to idle after being cranked up, I won't have a issue again until shut I off. It doesn't seem to matter whether it's hot of cold, or how long it has been shut off.

 

Either a vacuum leak or idle air control valve. I doubt the EGR is hanging up but it is possible.

 

It could be that the IAC needs cleaning.
It can also be due to shifted fuel tables.
You can only tell that with a Scanner looking at the long term fuel trim tables.
If they shift 25% or more a code and CEL will be present.
If no codes,you cannot tell from normal running except that idle and hot restart issues can be present, if they are not shifted enough to set a codes.
This is the tolerance built into the operating program before drivability and idle issues come about.
Good luck.

 

I have a similar issue

Have a 2002 ford f-150 rwd with a 5.4 triton.

every time I take it to the garage it stops. Here is the issue

On really hot days even if I don't run the AC in when i have to sit and idle it will start dropping to a low idle and even if I put my foot on the brake it will try to lurch forward in self drive but If I am right behind someone and I can't take the foot off the brake at all it might stall all together or take off but have no power then a few seconds later the gas will work again. Because of it not doing it all the time though I have not been able to pinpoint the exact issue I thought it was a faulty gas cap and maybe rain got in the gas but I put a new cap on and it was fine after that until today. I also noticed every now and then I need to unhook my battery cables so the gas cap light will go off in the dashboard if not it will stay on. I am not a mechanic so it really is hard for me to explain the issues but maybe with more interaction I can narrow it done more.

 

Just another scenario without a code is TPS, but getting the DTC with pin point it for you.

 

ucrenegade,
I already described the issue in detail in another thread you posted in.
You have to look at the fuel tables to see if they are shifted.
If yes you will have the issue you describe.
A vacuum leak you have to find and repair.
You can't depend on codes or guessing to tell you because the CEL codes are only the first level alert to an issue, not the whole diagnostic.
If some one doesn't look with a Scanner you will never solve the issue unless you get lucky some how.
I offer you my experience because I already been there and done it.
Good luck.

 

Thanks yeah my brother is coming to visit soon and I will have him scan it. The question I have though will the scanner pick anything up if my truck is not acting up that day? It doesn't do it everyday I can go days or even weeks in between my truck having these issue's so it has been hard to pin point like I said everytime I took it to the garage they say it drives great and no bad idling at all.

 

You have to read the data for the long term fuel trim tables as the percentage of shift to determine if there if there is a vacuum leak.
If a Scanner is not used properly it will never show any problem.
Codes are not all there is to it.
Pin pointing is all in the mind.
You have to think about that you see and relate it to the problem, then the repair.
Good luck.