Engine Performance problem
2000 Other Chevrolet Models V8 Two Wheel Drive Automatic 86800 miles
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I am at a lost on this issue. From a stand still every once in a while when I get on the gas lightly or heavy I would get a hesitation sometimes for up to 3 seconds before the vehicle would take off like it should. Also when I put the vehicle in reverse I've noticed that the idle speed would fluxuate (not sure how much but at night when the lights are on you would see the lights dim as you hear the motor surge) and it appears to be getting worse over time for both issues. In drive it is not nearly as bad and happens here and there. The tranny was just rebuilt just last year, fuel pump replaced about 5 months ago, just replaced fuel filter, wires, coil and exhaust man. on both sides due to both being cracked. I have check fuel pressure and the lowest I saw it when driving was 52 psi but average is 55 psi. I have cleaned the mass air flow sensor and looked at the electronic egr valve and the valve appears to be moving free. Please help any info would be great. I don't get any codes and when I have unplugged the electronic egr connection and then started the vehicle I get no code or change and same thing for the mass air flow sensor. The vechile is a Chevy W4500 that has a 350 motor and a 4L80E tranny. It is basically a Isuzu box truck but with Chevy parts and logos etc.