1988 GMC Jimmy idle erratic in park

1988 GMC JIMMY
166,200 MILES • V8 • 4WD • AUTOMATIC
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GMCJIMMY
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Rescently had a new long block put in, the idle is searching at idle, my mechanic has put in a tps, iac and a new ecm, no change as of yet, my question is when he checked the iac he told me he had power on only 2 of the 4 wires, thats why he changed the ecm, can you point me in the right direction?
Jan 20, 2008 at 11:56 PM
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RASMATAZ
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Have him check the fuel pressure and the EGR system that checks out-look for exhaust restriction.

Did he clean out the throttle body/air bypass passages/throttle plate.
Jan 21, 2008 at 1:23 AM