2003 Chevy Avalanche bogging down

2003 CHEVROLET AVALANCHE
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MORSOULGUITAR
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  • 1 POST
Engine Performance problem
2003 Chevy Avalanche V8 Two Wheel Drive Automatic

I changed my plugs and wires, but my engine still act like its missing boggs down till light dim.
Feb 7, 2010 at 2:06 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Engine running rough or 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.
Feb 7, 2010 at 9:21 PM
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