Its doesnt sound like a head gasket because i dont see that you said it was smoking at all. An easy way to check though is to drain the oil or check the radiator. If the coolant is brown then its the head gasket. If that is the stock cat in there then it could be that. If its that its a fairly cheap fix. Just take it to a muffler shop and have them cut out the cat and put in an ORP. My cat clogged up at 72k and i had them put in an ORP and it just cost $55. Not all shops will do this because it is illegal and the ones that do will can only accept cash.

 

does anyone think it could be a IAC valve?

 

I really doubt it, but its hard to diagnos online

 

yes id say its time for him to invest in a cable a laptop and data master!

 

well....i will find out to day, i did flush my whole system of coolant and replaced it and it came out dark green...and then put in orange coolant...so later today i will let yall know after the cat is off!! or replaced with a ORP w/e that is!!