2003 Chevy Blazer Mis firing

Tiny
DTSHANES
  • MEMBER
  • 2003 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 94,000 MILES
I just had my 2003 Blazer tuned up and the service engine light is back on and it is still missing at different speeds, kinda chugging and then it stops, it has been doing this for about a month! I am thinking its something not so complicated, fuel filter o2 sensor? Any words of wisdom?
Monday, January 11th, 2010 AT 8:32 AM

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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Monday, January 11th, 2010 AT 9:30 AM

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