[MeanGreen]

have you di-electric greased your sparkplug boot... bout the same height as the muffler. I had this problem a little while back and it was just the sparkplug wire comming loose from the boot.
not sure if this will help but i hope it does.

 

[MeanGreen]

i had the problem with the wire comming out of the boot because i had put to much grease into it. I would just check it and put a little bit of gease in the boot and unscrew the boot from the wire and put a little in there and screw in back on snap the boot on the plug and see if it helps. Not sure if this is what your problem is but it was mine so hope this works for you.