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

Question type: Maintenance & Repair

3 Answers

76,335

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.

It has TBI and I get where you are going. I will look for vacuum leaks.

76,335

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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