Well my idle is bouncing again. I took the IACV off and ran about half a bottle of carb cleaner through it and around 50 gallons of air to blow anything else out of it and all was good. Idled fine for a few hours and now it is back again and I have no idea what it can be. Can't be the fast idle thermo valve because the people who put the engine in said they bypassed it.

 

Check to see if it was done correctly, its most likely the FITV

 

How would I know for sure if it is done correctly? Sorry I don't do much motor work I build custom audio/video systems