Backfiring in the TBI

My car decided 1 day not to start, I have used starting fluid to get it running before with no problems, But today I tried using it and my car backfired twice and then caught fire inside the throttle body. The car still will not run. Anyone with an Ideal as to why? I thought that with a TBI you could not have a backfire problem.

Did you check your timing? Thats where I would start.

Ok timing is waaaaaaay off. At least 10 degrees after TDC! What could have happened?