Ok, I think I might have a pump going out. What happens is the truck sometimes noses over when I hit the gas from a stop. It idles and drives fine except under real light throttle like in a parking lot, it seems to surge a little. It does this with a full tank or with a 1/4 tank so I don't think it is being caused by the baffle in the tank. Timing is good, everything else seems ok. I am going to change the fuel filter and plug the egr valve. This is an 89 350 tbi. Any other ideas. BTW the pump is most likely origional.