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1990 GMC C1500 Questions & Answers
Why does my 2.5 GMC sonoma truck skips or misses?
Worn timing belt or bad map sensor, weak ignition coil, worn distributor gear (usually starts hard with that) Leaking manifold gaskets all possible causes. Start with a new coil, spray starting fluid around manifold gasket while running, if it revs up in any certain spots, manifold leaking (intake only test), check vacuum lines for cracks and leaks,(MAP) replace sensor. Over 75,000 miles probably timing belt, recommended change interval is 60,000 miles.
Tail lights
remove the taillights from the bed and check if you are geltting power from the switch. The circuit board the bulbs plug into sometimes goes bad.
Lee
I just rebuild my 1990 gmc 4.3 v6 engine and now
this could be many different issues. you could have a lower degree thermostat, if the block wasn't boiled and flushed you could have coolant restriction in the block causing less flow to the heater core,or you could have put your heater core hoses in reverse flow.
Ok my 1990 gmc i got the pipes and plugs replaced
probly hav a weak fuel pump or pump regulator-in engine area--did u change plug wires and distributer cap-they go bad but dont show it--throttlebody area may need cleanin--egr valve cud hav an issue--and the fuel injection--its 20 yr old
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