I just got this bike, 11,344 miles, been sitting awhile. It would start mmediately when I first got it, but after riding it 1/4 to 1/2 mile it would start to stumble and eventually get so bad on the way back, the only way to get it home was to crank the throttle wide open so the bike would run at idle... allowing me to limp along at 4 mph in 1st gear to get home. When I got home I let off the throttle and it stalled and wouldn't start back up. The next morning, it fired up immediately, idled perfectly and did the same thing riding around my neighborhood. Now today, it wouldn't start, but when I finally got it running it wouldn't idle without me regulating the rpm with my right hand. If I let go of the throttle it stumbled and died. I've read a lot of posts on here for similar things but they don't match my problem...I'm baffled.