Our recently purchased 1992 Chevy 3500 with 454 Idles rough when cold.Installed new MAP sensor after unhooking it fixed problem. New MAP sensor resulted in same simptom.

Asked by airport17 Mar 08, 2017 at 11:46 AM about the 1992 Chevrolet C/K 3500 LB 4WD

Question type: Maintenance & Repair

3 Answers
224,085

Rowefast answered 7 years ago

Does this have a TBI on it? Or is it a multi port fuel injection. Try snugging up the intake manifold bolts to start with, and run some fuel injection cleaner threw the gas.

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224,085

Rowefast answered 7 years ago

Also since it is a TBI watch the 2 injectors spray. The fuel spray should be a nice cone shape with no droplets at all. Thats where the fuel injector cleaner comes in.

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