1999 Pontiac Grand Prix wont start

Tiny
BUDDHA6940
  • MEMBER
  • 1999 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 120,000 MILES
Did a scan on my 1999 grand prix 3.8l and po300 code came up, says random/multiple cylinder missfire detected. Where do I start/ check first.
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Wednesday, June 10th, 2009 AT 9:38 AM

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Tiny
RASMATAZ
  • MEMBER
P0300 random misfires normally means vacuum leaks and bad fuel

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel
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Wednesday, June 10th, 2009 AT 9:53 AM

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