!998 4.6 F-150 Auto 2wd 153,000 Miles
Starts up like always and runs fine so long as I keep it running with a little gas but let up on the pedal and it stalls out.

IAC ? MAF ?

 

Check for a vaccum leak either at your pcv valve elbow or possibly intake manifold, wouldnt hurt to clean the iac with some seafoam deep creep or the maf with some electrical cleaner(very gently I might add).

 

Sounds like a sticking IAC to me.

 

I cleaned the IAC and it's Fixed.

Many Thanks !!!

What a great site.

 

I have the same problem, but could you tell me what the IAC is? I have installed a K&N FIPK kit over this past weekend and now I an experiencing this problem. I'm going to give cleaning it a try once I knwo what it is.....

 

50th ann you may want to just pick up a new IAC because cleaning it is only a temporary fix. I bought one at the dealer, I know the guy, so I only payed $60 but they usually retail around $80.

 

viper 26 I can't seem to find the link but do a forum search on IAC or Idle Air Control valve and you will find what you are looking for.

 

OK thanks, but do you know what the IAC is? Or what IAC stands for?

 

Thanks Fxxer, I will do that.