I drove my car yesturday and everything was fine, now when I hit certain rpms it starts to feel like more vibrations in the drivetrain and when i turn it off its real rough, not like caughing or running rough just turns off and noticebly more vibration, any thoughts?

 

Well I found the problem, looks like a big *** rock got lodged between the cat and the frame, thank god thats all that was!!

 

Good news eh. Glad to hear u found the prob.