today when i went to back out of my parking spot something very weird happened. i started it up and it was really rough, more than usual. then i put it into reverse and the engine stalled and turned off. then my check engine light came on. this happened about five more times. i had to have my friends push me out of my spot. it only happened when i was in reverse though. then when i got home which is about a 5 min drive everything was working fine for the rest of the night. what could be causing this? and should i be worried about it?