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Popping/stumble/backfire issue


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The past few months my truck has been acting up, during accentuation around 50kmh my truck will sometimes rapidly start backfiring. I thought it was my fuel pump so I did a pressure text and I got 49psi. Usually around 3/4 throttle it'll backfire. Any ideas on what it could be, I changed my spark plugs 3 months ago, I put the right gap on them. I don't think it's a miss fire because I don't have a check engine light. 99 gmc 5.3

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