Shuts off if you do not keep your foot on the gas

Had old fuel in it, didn’t drain it, but put some new gas in it. Starts up just fine now with a new battery and everything. However, when you’re driving, if you don’t keep your foot on the gas it shuts off in the middle of the road.
That happened and now when you turn it on, it idles fine but you can barely crank the wheel and putting it in drive and pressing your foot all the way down doesn’t do anything. It just starts rolling backwards.