Ok, my car is and has been idling very iratic, from abour 1000-2000 and up and down up and down, ive capped off all my vacuum lines excpet for the 3 that are maditory i did that last week so i know its not a vaccuum leak, i checked my collant lines and let the little air that was in out, and i got a USED iacv valce and stuck that on there as well. still nothing, i checked to make sur emy map and tps sensors wires wenrt crossed so i swithced then, it makes it idle almsot right about about 900 rpms, but then if u give it the slightest gas what so ever it dies. Im thining my replacedment iacv is bad as well, but is there anyway to test this or anythign else i should check? i reset my ecu multiple times, i even reset my timing thikning that would help, im all out of ideas, any one????

thanks in advance

 

did you replace the gasket between the EACV and the intake manifold?