2000 Mitsubishi Galant timing belt

My car stop on the road. I had it towed to the shop he told me that the crank sensor was bad after the diagnostic. When he got ready to put the crank sensor in he noticed that the timing belt was getting ready to break so I had it changend also. Now the car starts but only if I press down on the gas. If I just start the car up it just turns what could be the problem.