So when i come to a stop m rpm's are around 500 but the needle slightly (ever so sliightly) jumps. Barely noticeable. Also they go just below 500 with a slight vibration. Is this normal? IVe changed IAC, O2 sensors, TPS, Cleaned TB, egr ports, maf, air filter. No vaccum leaks. I dont know? Runs great. I changed O2 sensors due to CEL that went off. I dont have one now? Maybe PVC valve? any ideas would be great. Couple of buddies have f150's and they have perfect idle w/o fluctuations? Maybe im missing a Vaccum leak.

The neat thing was the chemical rxn you get when you soak your old IAC valve in bleach. I dont recommend if you plan on cleaning and reusing. Gonna want to throw away after you do this. Let it soak for about 5-10 minutes.

 

4.6, 2001 xlt, 58000 miles

 

ford tells the mechanics its safe to use B-12 carb cleaner on EGR TB and IAC and MAF to clean them.... but u should take ur truck get them to hood WDS up to it and test the TPS sensor

 

I replaced the TPS, I dont think you can really clean it.