I have a 2008 Ultra Classic. I have a K&N air cleaner true dual exhaust Cobra fi2000 fuel pack and 255 Screamin Eagle cams. When I am riding and the bike is warmed up I pull up to a stop sign my bike acts like it is going to die idols down to around 500 to 600 RPM's. I put the Cobra fuelpak on because I had a vance and Hines fuelpak thought that might be the problem. I have 70,000 miles on my bike and am really at a loss as to what the problem could be. I've tried new plug wires and spark plugs change my fuel pressure relief valve new fuel filter still no change. please help!!!!!