1990 Pontiac Grand Am running terrible

1990 PONTIAC GRAND AM
125,000 MILES • 2.3L • 4 CYL • 2WD • AUTOMATIC
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BABYGIRL2800
  • MEMBER
  • 1 POST
its running terrible and when you hit the gas it will backfire i changed the quals and everything thats not it i have no idea what it could be got any suggestions
Jun 23, 2014 at 8:09 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
scan for codes and check fuel pressure with a gauge first autoparts rent the gauge. then check compression and look for a vacuum leak
Jun 23, 2014 at 11:00 PM
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