Car starts and idles fine. After about 5 laps the engine starts missing and losing power. We changed the red box and went out for the feature. At almost the same laps during the race, same thing happened. The car has had 3 different red boxes with the same results. Going to try a new blue plate. Other suggestions have been a coil problem, or possibly a fuel pump. It seems to be once the car get hot it happems. Anyone had anything similar? Was hoping for some good advice so I can quit throwing money at it and get to racing. Thanks