Engine Performance problem
2000 GMC Truck V8 Four Wheel Drive Automatic 145000 miles
My engine is sometimes running really really rough and bucking and throwing it self all over the place when accelerating and idoling but other times it's not as noticeable. No codes have been thrown over teh last few months so i've systematically started replacing just about everthing I can. I've replaced my fuel pump, fuel filter, spark plugs, spark plug wires, air filter, distributor cap and rotor with factory equipment. Sometimes the engine misses more than others but it consistently back fires, i'm running out of options now, the only two things I can think of to replace would be the MAF and Electronic Control System. Any other suggestions?