ok my 93 delsol broke down tonight it kinda sputtered to a stop i think it was one of these three things but im not sure 1:my dizzy 2:my spark plugs 3:my fuel pump. my dizzy is cracked its about a half inch crack also my car has been backfiring allot lately; and before when my car worked the fuel pump whistled pls i need all the advice that i can get i greatly appreciate it and thank you