Idle issue on startup the good after 20 to 30 seconds ??

[Uno99]

My 2002 GTP has been acting squirrely lately.

The car starts then as soon as you hear the loud sucking from the CAI it starts to stumble. I can keep it running if I work the throttle a bit then after 20 to 30 seconds when the loud sucking from the CAI stops it will idle and run just fine.

I replaced the IAC valve, fuel pump, fuel filter, plugs, wires, added a caspers hotwire kit.

No Codes
Ive tried unplugging the maf but it will not stay running.

Thoughts? Ideas? Thanks guys

[Scottydoggs]

dirty TB? bad fpr?

[MCbatt]

Mine did that when I first put mine on, it was from the maf. I tried unplugging it to see if it would run that way and it didn't make a difference but I ran out of things to try and just replaced it, after that it ran fine.

[Fivefingerdeathpunch]

The sound is from the air rushing past the IAC passage inside the throttle body.

Perhaps the IAC is opening too much and killing it out.

[Uno99]

I just changed the IAC this evening ugh. It weird that th issue is intermittent and only last 20-30 seconds after startup and happens less when the engine is warm.

[Uno99]

Still the same after cleanin Maf and TB my wideband goes way lean 17:1 then 18:1 the off the gauge after that.

[Uno99]

Just wanted to post my solution. There was a gap between battery and terminal. Even tho i had the battery bolt as snug as possible the play between was causing intermittent issues. I simply placed a steel washer inbetween and tightened it up no isssues since