I was wondering if anyone could help me figure out wy i have a vibration

as i am driving you can feel a heavy vibration in the car let you foot off the gas it stops, which leads me to believe it isnt the tires or alignment since it rolls with out vibration.

When driving at normal speed if you push in the clutch and rev the engine there is no vibration, which leads me to believe that it is not in the engine

does someone know what could be causing this???

 

Drive shaft, rear U-joint most likely.

 

thanks i will look into that