I bought an 85 GL wagon out of a yard and got it running. Starts and runs great for about a quarter mile and then stumbles. if I pump the gas I can keep it running but the minute I try to move it just stumbles flat on it's face. I'm thinking it might be water in the gas, possible bad choke, or that I have a fuel delivery problem in the pump, filter, or carb. I added water remover and am waiting overnight to see if it makes any difference. If anyone has the same experience or ideas, I'd love to know. I'm not too shure if it matters but it is the hitachi carb.