I have an 02 Ultra Classic that backfires and misses in low rpm range (2100-2200) which causes the bike to jerk. This is a very annoying problem. I took it to a HD dealership and was told they could find nothing wrong with it after three days. They said a HD service tech advised to change the exhaust to see if that was the problem. I put stock exhaust back on and still have the problem. I have tried to replace plugs, fuel injection cleaner, and some other simple things with no luck. If anyone has an idea, please help

 

Have the intake manifold seals been checked ?