Thanks Print Dad for the info. The engine was rebulit about one year ago. The car was running fine until one cold day in November my daughter took the car over a friends house and left it parked outside for about 6 hrs and ever since then, it has not been running right. Normally the car is garaged kept. One other thing, a week prior to that, my daughter ran out of gas so i brought gas to her in a plastic can which was setting out in the yard for a while. That is why came to the conculsion water may be in the system. I drained most of the gas out and put new in with a solution called Heet, it ran fine for about 20 minutes, then back to rough idling, misfire, etc. I've checked the vacuum lines, they are fine. I replaced all the spark plugs, the wires are good. Replaced the fuel pump and filter. Is it possible for the timing to jump due to cold weather? Maybe I need to check to see if the timing is correct.