Thought I'd share this for the masses. My '95 Stingray with a 4.3 L V-6 was dieseling real bad and I got the bright idea to throw it into gear to stall it. Bad move. It sucked water into 3 of 6 cylinders and promptly seized the motor. The first mechanic pulled the plugs and tried to turn the motor - no luck. He directed me to a Mercruiser mech for an engine change. Lucky for me, he tried a substance called eco#@! (I didn't quite catch it, like Kroil but not Kroil). Long story short, after 2 flushes with diesel fuel, new plugs, rebuilt carb, and an oil change she runs great again (sometimes the Lord gives grace to boneheads). Lesson learned (to prevent the costly dieseling) - 1) Don't use crappy gas 2) If it idles too fast, fix it. 3) Run your motor in idle for a minute before shutting it off. (There is a merc bulletin on dieseling)Note: I am running Marvel Mystery Oil in the gas as recommended under the table by the mechanic. - Later 
