I THINK A LOT OF IT WAS DUE TO AN ILL HANDLING CAR. IF HIS CAR HAD BEEN WORKING WELL HE PROBABLY WOULD HAVE STAYED IN A LOT LONGER IF NOT THE WHOLE RACE. WHEN ANDRETTI CLIMBED IN AND DROVE HE ASKED THEM "HOLY COW...WHAT HAVE YOU GOT IN THIS CAR" BECAUSE IT WAS SOOOOOO BAD!!
EVEN WHEN JUNIOR IS HEALTHY HE DOESN'T LIKE DRIVING A CRUDDY CAR. THAT'S WHY HE PULLED IT TO THE GARAGE IN VEGAS.