do you have smoke blowing out of the exhaust? if so, you probably have fried piston rings oil is getting into the combustion chamber. this could possibly cause your spark plugs to foul out. if thats not the case, a couple of the teeth on your timing belt may have broken and it could have jumped time a lil bit. that would explain the unburned fuel on your plugs. the plugs are not firing when the fuel is in the chamber. ummm...thats all i can think of right now. if i think of anyting else, ill post it. good luck.