My daughter's '91 Integra LS (80,000 miles) has failed to start 3 times in the last year, many months apart. The starter is turning fine, battery's fine etc. The problem is either fuel, spark, or timing. In this case I suspect timing/valve related. Twice the occurance has been after the car has sat for a week or more, and then it starts once, is driven a short distance and shut off. Upon trying to restart, it won't run. It backfires, and tries to run but won't. Both the 1st two times it eventually cranked and ran rough for a few miles, then eventually cleared up, and ran fine for several thousand miles. Today it happened and it won't start. She's 250 miles away at college, so I can't really do much but have it taken to a shop. I don't won't to get taken to the cleaners, so I need some advice.

P.S. The timing belt and water pump were replaced in August before she left for college, and she has driven home 8-10 times since then, with no problems.