We had this thing happening in an 81 chevy manual transmission where you would press the accelerator, and the engine would rev up, but the truck wouldn't move. We could get just enough movement almost to make it back home but got stuck on a hill. Had to roll it into a KFC. The engine could start, but it was backfiring. We have a clear inline fuel filter so we could see that the gas was pretty cloudy from water. I've tried to do a compression test, but the battery has been dying quickly. Its been a few weeks now working down the list of many things that this truck needs. We still haven't been able to start it though. We most recently replaced the starter, and then the old crusty wiring snapped in my hand. So we're doing a lot, but I want to get some ideas based on what was going on when it died.