I have a 1989 gmc s-15 with a 4.3 liter. Truck runs alright but is kind of sluggish on take off. Also when jumping on freeway i step on gas and it takes it a while to pick up speed. Revolutions go up

Asked by Apr 21, 2014 at 04:42 AM about the 1990 GMC S-15 2 Dr Sierra Classic Extended Cab SB

Question type: Maintenance & Repair

But it seems something is holding it
back. Changed sprk plugs,wires,fuel
filter , injectors and it seems to be the
same. Can anyone help

5 Answers

32,365

Have you checked the braking system? Could be the emergency brake is hanging up. After your next drive, try sprinkling water on the rotors and or rear drums. See if you get steam or rapid evaporation.

Its not the front or rear brakes already checked that

32,365

How about a compression test? Are you experiencing any oil consumption?

Xompression is fine and no oil consumption

32,365

Could the problem be the exhaust is plugged? Is the CEL on? I'm running out of idea's.

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