I currently run 09 teryx with vfj clutch, 2'' snorkels,supertrapp slip on, MSD,clean stock air filter. Problem is when I added the msd on setting 4 ,It runs great , tuns more out of the hole ,snappy throttle responce,nice 67mph top end, but when you first start it , it idles alittle higher than normal then goes down to little lower than normal and alittle choppy and stays there until you hit the gas again. Is this normal ,I also tried adding 2 1'' holes on top of the airbox for alittle more air but did not change anything . Checked plugs twice ,they are not showing really anything nor black or white,slight black at the top of threads . And does not make a difference if it is warmed up or cold. I was thinking just from the timing advance that this is normal, because when I put it on setting 3 which is stock, it idles fine but big loss in power.