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1997 GMC Sonoma engine misfires

Tiny
RBURTON81
  • MEMBER
  • 1997 GMC SONOMA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Engine idles smooth. When given gas it misfires. But if given alot of gas it runs smooth. Changed plugs, wires, distributer cap and bud, fuel filter, and air filter
Monday, August 10th, 2009 AT 6:22 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine misfiring 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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Tuesday, August 11th, 2009 AT 3:37 AM

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