Car vibrates at 60 mph through 80,stops anytime I let go off the gas pedal

What is your question?

1. Broken of lug nuts the wheel hub was stuck so the mechanic installed a used aftermarket spindle, that's when vibrations started, also installed after market drilled and slotted rotors at the same time (car also pulls to the left or right sometimes) 2. Mechanic said maybe the tires out of balance, got it done, still vibrates 3. Mechanic said alignment, got it done still no help 4. Mechanic said bent wheel, changed the wheel still no change 5. Mechanic said driver said CV axle replaced it, still vibrates 6. Replacing the mechanic and looking for a new one. (and trying to figure out a solution)