I HAD A NEW RACE CAR DO THE SAME THING AFTER I CHANGED ENGINES, THE ENGINE DIDN'T HAVE A GOOD GROUND, MY BATTERY SAT AT THE BACK BY THE FUEL CELL AND THE GROUND WENT TO THE CHASSI AT THE REAR SO THE ENGINE WOULD BREAK DOWN FROM 4000 UP IF YOU JUMPED ON IT. WE TOOK A GROUND WIRE WENT FROM THE BACK BOLT ON THE INTAKE TO THE CHASSI AND PROBLEM FIXED!!!!!! WE LOST 4 RACES OVER THIS........
BUD