Thanks for reading my post,

About a month ago I was driving home from work at interstate speeds (65-70 mph) when the truck slowly started losing power and slowing down. I got off the interstate and took back roads home (about 5 miles worth) because the truck would only down about 40 mph. It seemed like a fuel issue so I changed the fuel filter and checked fuel pump pressure.

The codes showing were P0102, P2196, P2198, and P0068

I took apart MAF sensor, throttle body, and piping which was all coked with oil. I changed out the air filter, and cleaned the MAF, throttle body, and piping.
I checked the throttle position sensor plug and also checked for ground, 5 volt common and then the variable voltage with different positioning of the throttle senor. I was having a hard time getting decent readings.

The truck seemed to get some power back but still was sluggish from idle to 10 mph. The truck shifts really hard now. It also seems to hunt for idling setpoint. It revs from 400-1200 rpms. When idling if you try to rev the engine it sputters unless taken slow. Then about 2800 rpms it stops and will not rev any higher, it almost acts like a rev limiter and cuts out?

Any ideas on what to look at or check? I'm leaning towards a vacuum issue or throttle position sensor problem. These are the next things I'm going to check but wanted to get every ones input before hand.

Thanks for any info in advance!!

 

You've been busy on this puppy again. Good idea to post up the trouble code clues you've found. Were they pulled Before the service, or after? Were they pulled with your ELM scan tool?
Remember we're to work & put right the Lowest trouble code numbers first.

Thinking about that, I looked up some of your vehicle history & wonder if you got the computer electrical connector insulator cleaned up really good, as all those carbon arc trails shown in this nice feedback photo series you put up about a year ago here, https://www.ford-trucks.com/forums/1...l#post16700350, might be in play on the current MAF circuit A low voltage P0102 you posted above.

Seeing the woes of a year ago & present, have corrupted fuel trim Rich in both cyl banks & we don't know how long it's been driven combined with corrupt fuel trim, cat converter internal matrix melt down, causing excessive exhaust back pressure may be in play on the wimpy engine power out. So, once you get the corrupt fuel trim fixed, perform a clogged exhaust back pressure test. Seeing as you seem to like doing your own trouble shooting & wrench turning, you can do the clogged exhaust test using your vacuum gauge, scroll down & follow test scenario 14 here How to Use and Interpret a Vacuum Gauge

The oil contamination of the intake side plumbing might be caused by a faulty PCV valve, so since it's due mileage wise for replacement, you might consider it's low cost replacement as part of your vehicle scheduled maintenance update.
If that doesn't remedy the intake side oil contamination, are you using the specified viscosity & service grade engine oil & if so, with a new Ford PCV in place, perform a crank case pressure test, looking for excessive piston ring blow-by, from sticking, or broken compression rings.
If your Innova 3100a scan tool will perform a power balance test, do that & see if it'll flag a cylinder & go there & perform a compression test.
If low & you suspect a stuck piston ring, maybe try a overnight piston soak with a couple teaspoons of Marvel Oil in that cyl. Then disable the fuel pump & spark & crank the engine over a few times to clear any remaining oil, before re-installing the spark plug & starting the engine, so as not to hydro-lock the engine & bend something up, if the Marvel Oil didn't soak past the rings overnight.

Some beginning thoughts for consideration, let us know how the trouble shoot goes.