Has anyone experienced rough starting issues and erratic tach between 2,000-3,000 rpms? Will stall two or three times trying to get out of my uphill driveway. Pops and backfires....tach needle jumps up and down between 2000 and 3000 rpm....I don't want to have to put a power plug on a new bike. Dealers worked on bike and now stuck in S3. Any help would be appreciated.