i think ive got it narrowed down to the coil on one side of the engine. it is burning the end off the spark plug(has happened twice) then it starts skipping. new plug then its good to go. it lasts about 10 hours in between it burning it off. is there such thing as coil sending too much fire to spark plug? any advice on how in depth it is to change? Note: engine also "ticks" while running.