1999 Pontiac Grand Am Engine starting ruugh

1999 PONTIAC GRAND AM
124,000 MILES • 6 CYL • FWD • AUTOMATIC
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KRAZYAL
  • MEMBER
  • 1 POST
When starting, it sometimes knocks and pings for a few minutes. I've changed the oil, added valve queting additives, fuel injecter cleaner, and changed the type and location where I buy gas. This works for awhile but it comes back.
Mar 31, 2009 at 4:28 AM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
Remove plugs and inspect them, look at link below and see which condition best matches your plug:

http://www.2carpros.com/how_to/how_to_change_my_spark_plugs.htm
Apr 1, 2009 at 1:47 AM
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