Mechanics

GMC ENVOY FLOOR PROBLEM

2003 GMC Envoy • 40,000 miles

This happens once or twice a year when really cold. It starts good but when I accelerate it makes a pinging sound then slows down to no more than 10-15 MPH. If I pull over & floor the gas pedal it will not rev up. After I turn keyoff for a minute it takes off just fine
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December 27, 2012.



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