my mustang which i just got done putting in a aluminum headed cam intake injecter 302 was running great the motor has been in the car for about 2weeks and all of the sudden yesterday after getting gas becuase i was on E the car will idle but dosent sound like its firing on all 8 the idle isnt bad when i put it in gear is just stumbles over itself bad gas? ignition module? coil? computer idk any ideas?