If there is coolant around the spark plugs,where is it coming from,do you have a leaky hose?that could cause your misfire,if the coolant is coming up past the spark plugs(they may be loose)it shouldn't,I reckon your head gasket is blown,take it to a garage,it costs nothing for their opinion unless they do the work,DON'T mention head gasket,if they suspect it they will tell you(then we're both right)Take it in be humble SUGGEST NOTHING and be prepared for the bill.
anon, January 2010