My car is pulling hard left on acceleration at any speed and starts swerving right when I let off. I can steer the car with the gas pedal basically. Alignment is in check. Any ideas?

 

Tires, rims, loose suspension or steering component ? Maybe a bad rack ?

 

Try switching the front left tire to the right side and see if it pulls in the opposite direction, If it does its your tires.
Also tire pressures make sure they are equal, If not equal it can cause pulling.

If none that worked and you checked what 3.2tlc mentioned then its simply a bad alignment, I would take it back to them.

 

Turned out to be a radial tire pull guys

 

Thanks for the update. Was it driving normal and quietly just cruising? Just pulling hard left on hard acceleration?