[Shogun]

69fastback, clean your Idle Bypass Solenoid (IBS) throughly, the IBS is located on your Throttle Body facing the front of the car left side, it is postioned at a 45 degree angle in relation to your TB. It has two mounting bolts and one electrical connection. Once that is clean, remove and replace the Intake Air Temperature (IAT) sensor located on the right side of the intake (lower) behind the coolant temp sensor. This sensor may be gunked up a faultly IBS. This sensor helps to control Air Fuel ratio in open loop. Also, replace those O2 sensors, you are KILLING your performance and fuel economy by not having them present. They communicate directly with the EEC-IV during closed loop operation monitoring the amount of O2 in the exhaust which in conjuction with other sensors helps set air fuel ratio etc.. OK, getting wayyy off the subject. Try those first.

Oh, one more thing, I think the reason your having problems, I believe your EEC-IV is running in Failure Mode Effects Managment (FMEM) this occurs when you lose a sensor or one goes out of range. The computer has preset values to cover that damaged/dead sensor and your engine will operate but not to its full potential. Ok, too long I know. But to Qutoe NBC "The more you know".. Hey anyone feel free to jump in if I stated something wrong.