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 malandrin420911 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
63,145

BoholMark answered 10 years ago

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.

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63,145

BoholMark answered 10 years ago

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

1 people found this helpful.
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63,145

BoholMark answered 10 years ago

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

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