GMC 1500 1/2 ton w/4.3L V6 TBI - Back fires

Ferrum_Caminus · 03-07-2005, 07:56 PM

Hello all, my truck has now started to back fire under load. The back fires occur as I accelerate. When I rev the engine in neutral it does not back fire. I have checked the vacuum lines and I belive they are in OK condition. Any ideas where I should start? Plugs, dist, rotor, and wires are new. Thanx in advance.

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