Bought the Bike Used from a HD Dealer 2004 XL1200C Sportster. 2400 Miles 2nd time I took the Bike for a ride It was Slamming into Gears Very Loudly, Had the Clutch adjusted and Gasket Replaced, Next Time out Bike began To Sputter and Stall, Difficult to restart, kept stalling and Backfiring. Finally Got it running at Higher RPM,s 17 Mile Highway trip was uneventful, but when I got off the Hwy to Local Streets, RPM dropped and Bike almost stalled , Had to Keep Revs up to keep from stalling, Got it home to Driveway and it seemed to Idle Fine without Stalling At a REAL Loss Please Help