hey everyone, I got a 03 classic with a 12.7 Detroit, I noticed while pulling a hill, when you get to the top and let off the pedal I get a vibration under my feet. I had the shop look at the driveshaft but he says everything's all good. I tried explaining the problem but he doesn't know. It does it all the time, could it be a week injector? He looked at the motor mounts and nothing. I just can't think what the prob could be, it's been aligned all new tires. Any help will be appreciated.