I've got a stuttering prob - but it's only once in a while....it can happen at any rpm or throttle position.... IE I'll be driving to work at say 70 mph and hit the gas a little to pass someone and I get nothing - then if I keep my foot in the same spot for a few seconds everything clears up and it takes off. Fuel pressure is around 34psi @ idle however sometimes it creeps up to 40psi and the car starts stalling - the car was supposedly rebuilt in stock form but I'm wondering if the fuel pump was upgraded and over working the factory fpr - any ideas?