i just got back from being out of town for 3 days and i heard it rained for 2 of those days. i forgot to put the caps on my stacks and when i started it up today, if idled fine and then as i backed out of the driveway i stepped on the throttle a little and it died. i started it back up and let it sit for a minute as it seemed to evaporate the water (i saw steam coming out). then i drove it the rest of the day and everything was fine. i know people always forget to cover their stacks and never have any problems other than soot coming out so why did this happen?