My truck has been acting totally f'd up at cold start. It stubmles and sounds like I have a big cam and almost stalls. Watching the boost gauge, it is all over the place from vac 25 to 10. Can't figure out what's going on. If I just let it idle for a few minutes it's fine, but, embarrassing when I start it and it almost stalls or actually does stall. it smells funky too. and i keep getting p0172 0175 codes. What the hell? Once I start driving it's fine after a few minutes.

 

i would seem to think if it were a vaccumn leak it would happen all the time. maybe the iat in the maf. man i wish i knew more.

 

Ill 2nd the MAF. Sounds like what happened to my camaro back in the day. Try cleaning it. I used WD40 and it worked great after.

 

so i should clean the maf with wd40? i'll try it

 

Use eletronics cleaner without lubricant

 

figured it out. I had adjusted my injector offset table in hptuners for some damn reason and that was the problem. idles great now. oops, i shouldn't be allowed to touch these things, lol.

 

Great, Glad you got it fixed.

 

Are you sure it was not mechanical and the retune is covering it?