Hi! I have an 86 Chevy pick up with a 350 4 barrel. I just finished rebuilding the engine completly... New rings, valve seals, main bearings, rod bearings, timming chain and gears, etc... It was working fine for the first drive but just today when I took it, it almost stalled on me a few times. And that only happened when hitting big bumps while trail ridding. It would run as if it was going to run out of gas for a second or two and pick right back up. A little help would be much appreciated.

Thx a lot!