bike is an 07 softail FXST with Vance & Hines Big Radius pipes, V&H fuelpak, and a high flow after market air filter. About a week ago after riding a Patriot Guard procession it would die when coming up at a light or going to idle (even at highway speed). The only way I could keep it running was to hold some throttle on. Accelerates just fine, runs just fine at highway speed. will pop back to life if you jump it at highway speed. I noticed after having the pipes installed (about a year ago) it will backfire at times when letting off the throttle. This last week it has been doing it even more. I've cleaned the air filter, cleaned the butterfly, check the throttle cables for binding and smooth operation. the butterfly will close about 80% if you let it snap shut, and then will close the rest of the way. Motor has about 14,500miles. I'm thinking of checking the settings on the fuelpak or resetting them. Any body run into this before? Thanks, Zorrgg.