i have a 99 jimmy 4.3 vortec. starts, idles great and drives awesum until you step heavy on the gas peddle. then it dies down and sputters. let off and it smooths back out. any suggestions?

Asked by Nov 11, 2015 at 11:37 PM

Question type: Maintenance & Repair

2 Answers

115,975

I would check your catalytic converter. It may be partially plugged up.

1 people found this helpful.
1,765

could be the coverter or maybe the fuel filter could be plugged

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    Tom Demyan
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