 Working on the car. I just put a new engine in. Got everything hooked up. Got the clutch working and everything. Went to take it on the 50-mile test drive in the driveway. Took it up 2,500 RPMs. Did my cam break in, no problem. Put a load on it, go to drive it. It stumbles. It hesitates. Brand new wiring harness, new air filter, new fuel filter. Fuel regulation is reading at 40 PSI.