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Random misfire when under load

Jeffhaynes
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Jeffhaynes Enthusiast

Jeffhaynes

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Have a 01 Silverado 5.3 4x4. Throws a p3000 random misfire when I was pulling boat. Doesnt do it just driving. Today when drove into town I put the tow button in and light started flashing check and random misfire. It wasnt running Rough and sounded normal. Is there something I should check. Only time doing it is when i got od off or tow mode . Thanks 

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