Rough idle?

Greg D

Registered User
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.
 
POSSIBILITY

DO YOU THINK THAT A NEW IAC AND EGR ASSEMBLY
WOULD ALSO BE DONE SINCE A NEW ENGINE IS IN WOULD THIS EVEN OUT THE HESITATION?

because these parts have a lot of years on them verses the new engine ?
 
i would clean the iac motor,tps motor and clean the throttle plate. i would do that before replacing any parts.
 
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