20 Most Recent 1988 Chevrolet Silverado 2500 - Page 2 Questions & Answers

more information and i can help....you changed the oil and now no spark?

Check air filter and housing to see if airflow is obstructed.Check Throttle positioning sensor, replace as needed.Check plug wires, replace as needed.

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Sounds like a flooded carburetor. Possibly float needle dropped since bowl was not full enough to keep float needle in place. This could be from improper adjustment during carburetor overhaul. When floats are set, some have adjustments for both top cutoff and bottom drop.Now if black smoke is not from exhaust pipes, you have a bigger problem. Could new fuel be contaminated with diesel? Also depending on carburetor type, the rear barrels of a 4 barrel carb can soot up if the rear barrels are not often open. Some rear barrel actuators are vacuum operated, others are mechanical links.Some other thoughts are metering rods can be extended and jam if either the seat unscrews or the rod hangs up. Not common, but possible. Free floating rust could jam the metering rod in almost any position. When placing a carburetor on the intake manifold, NEVER turn the carburetor upside down or at any angle that the truck would not normally go. The float pin can slide out of some models. Also, was the gas used from a 2 cycle engine like a boat or lawnmower that has oil in the gas?

unbolt the steering shaft

Yes it could be, check the inside fuse box. I would look up the fuse number but our fuse box diagrams only go back to 1993

u probly didnt need new sensors-did u havit scanned 1st------a dirty throttle body and idle contrl motor is common------use a nonchlorinated solution

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