I have an '87 Celebrity with 103,000 miles on it. When i park uphill, gas leaks from the engine somewhere. And, when i press the gas pedal after idling, the car hesitates before it starts to move. I was wondering if someone could help me figure out how i can fix this. Help would be greatly appreciated!

Unless you open the hood and trace the gas leak physically, it will be hard to tell where it is leaking from. I'd check the fuel lines going into the fuel rail, possibly loose or the rubber lines are starting to leak at the crimp. Also the injectors may be leaking out.
Gas is always a safety hazzard and I'd get that looked at asap.
All the best.