oh. take all the plugs out. then crank the engine. have some one looking for coolant to shoot out a plug hole, or see if the one or more of the plugs is wet with coolant. if its a head gasket the coolant leaking into the cylinder can cause the misfire.

bet a bottle of blue devil would fix ya up pretty fast too. search for vids on yt, they start out blowing white smoke and 30 minutes later its all normal running.