03 4.8 Silverado Misfire

carbon

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Jan 2, 2012
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Been an on going issue with my truck. Back fires on acceleration and at certain rpms while driving. When acceleration and cruising it has no power and misses really bad. New plugs, fuel filter and air filter. Pulled injectors and cleaned with carb/choke cleaner. Not sure if I have a bad coil pack or injector. Any help would be great.
 
Any ideas on this? When the issue first started it would accelerate like it was running on only a few cylinders then it would kick in all 8. Now it just doesn't kick in at all.
 
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