2001 Chevy Cavalier fire

This is caused by unburned fuel going into exhaust pipe and burning out. May want to have the catalytic converter checked, it may be the cause of this as well.

Well it is possible that if timing is off it could cause this, but most likely jumped timing would cause rough idle and you would hear bad backfiring, popping etc.

Would have to pinpoint the exact cause first.

Cat. Converters can cause it like I said so would need it flow tested to see if its stopped up, if so need to replace it. If timing is indeed the cause then would have to remove timing belt and put new one on. Is the check engine light on in dash? If so, may take it to local auto part store and ask them to run a diagnostic scan on your vehicle for the check engine light. Most auto part stores do it for free, compared to dealers' $70 - $100 charge.