OK..... my 91 has a new (reman) motor in it. The motor runs really strong, but at idle I feel a slight stumble wether the car is cold or warm. The idle appears to be @ 600/650 warm. I notice that if I slightly hold the gas pedal and bring the idle up just a bit, it evens out and runs perfectly. Any thoughts? Should I try rasing the adjustment screws on the TB? Cleaning the IAC or the TB?BTW, the car has all new plugs, wires, and motor mounts installed when the motor was done. The factory gauge shows about 20/22 in. vaccum at warm idle.