What causes power loss in a 1990 gmc 3500 3speed when going up any kind of incline or small hills can be doing 60mph and bogs down to about 30mph

Asked by Aug 26, 2015 at 08:22 AM about the GMC C/K 3500 Series

Question type: Maintenance & Repair

4 Answers

41,320

Sounds like something in the gas tank is being sucked into the fuel pump filter.

1 people found this helpful.
49,185

yes..first check/change fuel filter/pressure...

1 people found this helpful.

Make sure to check transmission fluid. Is it full? Clean? etc.

What was the problem? I'm sure you've figured it out by now! lol

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