i have a 94 mustang that is stuck in park, what could it be?
It could be the power to the brake lights. When you step on the brake pedal the voltage to the tail lights also activates the release solenoid in the floor shifter. Have someone check to see if the brake lights are coming on when you step on the brake pedal. There is usually a manual override near the floor shifter that can be used to release the park lock if there is no power i.e. battery dead. Look in your owners manual.
The above answer is likely correct, especially if you are parked on level ground. But sometimes parking on a slope may make it difficult to shift out of park. Let us know which situation applies to you.