i just rebuilt the motor in my 89, took it for a test drive and it drives perfect and runs great. it wont idle at all though. tested the idle air motor and it operates just fine and has power goin to it. it had a blown head gasket that is why i rebuilt, and they tell me that the exhaust from that will ruin the o2 sensors. but when the motor is cold it should run in open loop, so that shouldnt make a diff i would think untill it warmed. i dont know what is wrong with it any feed back would help. thank you