Rough idle-dies


Asked by Aug 08, 2016 at 11:47 PM about the 1992 GMC Sierra 1500

Question type: Maintenance & Repair

Okay, im having help and im desparate. I have a
single cab short bed 1992 gmc, 5.7l standard 5
speed truck, it has a brand new engine (3100) miles,
brand new trans (50) miles, but has original intake
and throttle body. It will idle correctly only for a few
seconds then starts to bog down. Ive replaced the
EGR valve, IAC valve, PCV valve, new spark
plugs/wires, new fuel filter, oil change, new battery,
clean filter ect ect. And im still in the water. Any help
will be of great use. Ill answer any questions

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