ok ive had it for a while.

takes forever to start up but has no problem turning over. once it starts up it ether barely runs, quits or runs fine. but when i go to stop it starts idling rough but clears out after a few secs when i start driving again.

im leaning towards the IAC because when i cleaned out my intake it was pretty dirty but cleaned it off. fired right up when i put it all back together started doing it after a while again. fixed the huge vacuum leak i had and im thinking that the IAC is sticking.

but ive unpluged my TPS and it wouldnt change a bit while running rough. Im going to go alittle bit further tomorrow with it to figure out whats up.

any ideas?

1990 firebird 5.7 bone stock

 

Try spray out your throttlebody with some good cleaner...Make sure to get on both sides of the flap.. Maybe another vacuum leak somwhere...Also check your MAF for any little debri...spray the wires off with carb cleaner....DO NOT BLOW DRY!!!

 

alright thank you sir. that's what i did to the intake when i had it off. but im thinking with the vacuum leak i had it just built crud back up when it was running like crap.

when i had the iac out it looked like it was on the edge of being saved or needing to be replaced. ill post up what happens tomorrow if i get anywhere with it. im also replacing the ac clutch tomorrow so i can have cold air once again =]

 

alright today i replaced the IAC.

ran better started up right away. i drove it alot today and the more i drove it the more it started driving like it used to. idle funny, take forever to start up.

any ideas what else it could be? or what to check

 

update

finally got some codes. 13/ oxygen and 32/egr