I'm getting popping(backfiring I'm assuming) coming from my exhaust and also what can only really be described as a "shuffing" noise coming what sounds like straight out of the air cleaner. Any ideas? As always thanks in advance. P.S.: I looked over some of the 'self-help' section and didn't really find it. Unless I saw it and didn't realize it. UPDATE: I looked at my vacuum hoses under the tank and have a 'Y' shaped connector that only has two hoses attached. When I plug the missing one the engine runs much better. Anyone have an idea as to where I could find a diagram/schematic of the vacuum hoses on a Sportster '96?