last night, we got a chance to look at things. it seems the MAP sensor wants to stay at 15-16hg, and the throttle position varies between 40-59%, even at idle. for some reason, the rpm at idle is a steady 650-700, yet at cruise, it jumps on my scanner between 164-1988. i know that is not correct because it is running very smooth. next up, the owner thought it might show something if it was watched from idle to shift point. and the driver side mount promptly destroyed itself ! so much for a little restraint. now until the mount is replaced, i'll take the MAP sensor off and inspect the intake port and sensor for buildup, and check the TPS for ohm readings through out it's range. but the rpm back & forth at cruise when the car is running perfectly, does that put the computer at suspect, or something else ? my scanner perhaps ? i'll check the scanner on my caravan today or tomorrow to get a ruling on it, as i am familiar with that system far more than this GM conversion system.