I was workin on my car yesterday, and I told my friend to rev the car a couple of times to see whats wrong with the car. cuz the car backfires all the time when i am takin off from a redlight. When i was in back of my car, and he reved, oil was shoothin out of my muffler. I want to know what is wrong with the car?

 

too much oil? have you ever ran nitrous on the motor?