How do i make both tires spin?
Why do you need to spin both tires? Haven't you learned how to drive yet?
Truth be told, the tire with the least amount of resistance is getting all the power, and without a locking differential, that is going to happen because you are overpowering the available traction.
In low traction situations, the total torque delivered to each wheel is limited to the torque that is required to make the wheel with the least traction slip.
Stop trying to show off with a 30 year old car.