GRC, thanks for the info. Is there any way you could email it to me along with the ecm pinout diagram so that I can try it out? I read through it and it sounds like good things for me to check. It says to check specific ecm pins though and it would be easier if I had the pinout diagram. If this is not too much trouble, my email address is scon@comcast.net. I am hoping that the race tuner will help the overall performance of the bike. But, I don't see how it will help this backfire. I guess it's possible. I see a throttle body for a late model touring bike on ebay. If it stays cheap, I may just buy it for parts. That would give me the injectors and intake sensor anyway. Thanks again