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I have a 2002 Avalanche 121,000 miles, service engine soon light is on, it has a constant sputter not a miss while driving, idles fine does not stall. The sending unit was leaking changed it and also plugs. It still runs decent but not getting full power. Air or fuel?
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At 150000 miles the plugs start to fail under hard acceleration the higher compression blows out the spark before it ignites the fuel. Random cylinder misfire causes the check engine light to come on. change the plugs!
If you know the plugs are fine then an ignition wire or a coil will cause the same symptom . If you had a code reader it would show you which cylinder is causing the miss. Beyond that a compresion test is needed.
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