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1988 Chevrolet Silverado 2500 Questions & Answers
Why will my 1988 Chevy will not accelerate past 25?
i would start by checker your cat converter is not clogged. There are 3 way to do this you can have someone start the truck and rev it while you check the exhaust coming out of the tail pipe it should be a petty good flow coming out of the tail pipe, if no flow is coming from the pipe then yourcat conveters are clogged. The second way is to remove the o2 sensors in front of the cat converter and try driving it to see if it was accelerate, if you can accelerate then you know it's your converter if not then i would look athe the distributor and or timing.
Heater problem
Either you have a short to ground in the wiring harness or heater relay is bad. the relay I am referring to is generally located close to the blower motor and acts as a Potentiomiter to control fan speeds.
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