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i have a 92 chevy 1500 350 and it idles high i replace tps and the iac valv?

i have a 92 chevy 1500 350 and it idles high i replace tps and the iac valve and it still idles at about 1500 to 2000rpm
mike, April 2009
possably throttle plate problem ..vacum leak ....is it setting any codes >? ecm could have went south
make sure there is not a idle releard for this model too

bg, April 2009