Yes I know what you are talking about exactly.. I had this problem. What I did was I backed the timing down to 12 you prolly could go to 13 but when i backed it down the problem went away. My timing was set at 15 and I think that if I'm not going to be at the track then I should bring it back down anyways.. I hope this works if not then just email me and I'll see what I can do to help you guys. My email is
ross_albright@yahoo.com.