1995 Geo Metro Won't Rev Up

I have a friend that knows cars better than I do working on my car. The timing belt snapped and even after replacing the belt, it wouldn't start. IT would turn over, but not start. He got it to start, but now said that it either won't 'rev up' or it 'runs away'. He suspects its fuel related, but is miffed. I have also recently replaced the fuel filter, ignition coil, and ignition control mod. Spark Plugs and Wires are new and he put a new distributor in. I'm miffed. He's miffed. What else could be the issue? Oh, and he has plugged his code reader to the car and it comes back 'data not available'. WTH!