why does 99 gmc jimmyloose power the gas i give it . .

Asked by Mar 18, 2016 at 08:37 AM about the 1999 GMC Jimmy 4 Dr SLE 4WD SUV

Question type: Maintenance & Repair

my 99 jimmy idiles fine and runs fine going 20 to 30 mph but when i give it gas
it wants to cut  .or idiling when i push on the gas it cuts out.

3 Answers

74,705

It may be a fuel issue or a spark (electrical) issue. i would suggest checking the fuel pressure at the Schrader Valve on the intake manifold. Fuel pressure should be 56 to 63 lbs. if this is a V6 or a V8 engine. Once fuel pressure builds up, turn the key off. The fuel pressure should not drop more than 5 lbs. in 3 minutes.

1 of 1 people found this helpful.

checked fuel pressure. running about 55 lbs. dropped about 4 lbs in 6 min.

74,705

Boy, that is border line readings, but not your problem. I am thinking the coil is bad. That can be tested at Auto Zone.

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