I think there could be something wrong with my engine. Last night i cleaned my engine, well it wouldnt start back up afterwards, after a couple of long tries, it did, and i noticed the temperature guage was jumping all around. Iwell, I got it home, and opened up the raditator cap. The coolant was bubbiling up alot, like foam. Well, I let that drain out, then i filled what was lost (about 2 quarts) with plain water. The temperature stayed more normal today, but should i go and flush the fluid, or could this be a more serious problem?