My '83 200E has had no problems until this week- it's started fouling the plugs, and yesterday i couldn't get it to run. The previous day it started and ran for a little while then died. The plug was fouled badly, i tried to clean it off but after a while it wouldn't fire. I bought a new plug and it started with the choke open, but only ran a few seconds and wouldn't start again. I took out the new plug and it was already fouled a little, but i still had fire. I also noticed a lot of gas in the bottom of the breather box. Is it possible that i am drowning it out? Does this sound like a carb issue?