Hey, I'm new to owning/riding a Harley and something doesn't seem right. It's a 2001 1200 custom with 25,000 miles, when I start the bike it runs fine and the idle is good, but when I start going it seems like the bike is stuttering and jerky.. It does that in pretty much every gear but only if I'm just barely on the throttle.. What can I do to try to fix this issue?? Thanks in advance!