GMC S-15 Questions Maintenance & Repair
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1989 gmc 4.3 mpgs dropped bad. lost about 40 -50 miles per tank. nothing done before that started. was running ok, had a rough idle but was getting decent mpgs. so far i have replaced the ignition c...
Ive replaced all sensors and fuel filter....im at a loss as to what to do from here
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
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