2006 Chevy Avalanche mis fire

2006 CHEVROLET AVALANCHE
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ABDULLAH 2
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Engine Performance problem
2006 Chevy Avalanche V8 Four Wheel Drive Automatic

I have 2006 avalanche 2500 8.1 ltr . I recently have code P0300 random / multiplecyl . misfire detected . That happened when i stepped hard on the accellerator , but when i release the accellerator the check engine light disappear .

In minde these message coming after i changed the tires and the new tires are bigger than the old tires

Also i changed the spark plugs . For the old sparks they were in white color and i drove it just 6216 Mil (( 10000KM ))

Thank you for your help
Jul 21, 2009 at 8:02 PM
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RASMATAZ
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A Random Misfire P0300 code usually indicates a vacuum leak or bad gas.

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.
Jul 21, 2009 at 8:12 PM