oh man lol..... Mine did the Idle thing...it burns off built up fuel that didnt all get burnt while running, so you might need to jet...or burn diff mix (unless you using injection) uhm... Get a new plug...check your carb, clean it if necesary (id probably do that anyway...), gap the plug corectly...turn your idling all the way down and back out a turn and a half i think it is, and turn your air fuel mixture all way in, and 1 1/4 turns out or more...just dont tighten it in tight or you will hurt the seating...and dont turn it out more than 3...your just gunna kinda have to play around until you get everything set, also, DO A COMPRESSION CHECK B4 YOU DO ALL OF THIS