2000 Pontiac Grand Prix Service engine light flashes and s

2000 PONTIAC GRAND PRIX
65,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MR.MIKE1956
  • MEMBER
  • 1 POST
Car began tio misfire and run like a cylinder was not firing. Engine runs fine at idle and with light acceleration. Misfire returns under heavier acceleration. Car misfires under load
Nov 25, 2008 at 2:16 PM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
I would have the ignition module tested at any autoparts store for free.

If OK, then check fuel pressure with a mechanical gauge.

If OK then remove and inspect spark plugs, look for gas/oil soaking.

If OK, then have a backpressure test performed on the CAT, it may be partially clogged.

If OK, then I would replace the plugs/wires and coil pack.
Nov 26, 2008 at 11:57 PM
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