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

2 Answers

18,840

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

25,575

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

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