Thanks for everyones help. I changed the oil. I dumped it out and then put just enough back in to register on the dipstick and started it up, let it run for about 3 minutes, dumped it out again and then filled it back up. It stumbled for the entire time I had it running the next day. I finally parked it in the driveway and let it idle for an hour and a half and now it's running like a charm. Just needed to get a little heat in the engine to burn out the extra moisture.

I'm still having a little stumble from time to time but that was there before the water problem. I'm guessing I just need a good carb cleaning.