I have a 2000gsr and i've been driving pretty hard these past years. Right now i have 55,000miles on it, yea i know it's a lot but it's starting to shake harder than usual. Is this common or is something wrong? I've done the usual oil changes, spark plug changes, and filter cleaning since i got a CAI. So what do you guys think is causing it to shake? I read i should change my coolant by this amount of millage but could this be why it's shaking? Any opinions or suggestions would help. Yes, i could bring it to the dealership but i want to fix it myself w/o paying an arm and leg.