what makes a 1999 pontiac grand a.m back fire when its in drive

Asked by May 10, 2014 at 11:46 PM about the 1999 Pontiac Grand Am 2 Dr SE Coupe

Question type: Maintenance & Repair

it act like it not getting gas i change the fuel pump an the core

2 Answers

it could be the crank sensors

108,725

Could also be a timing chain issue.

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