I have a 1986 Ford LTD Crown Victoria Station Wagon. 302 Fuel Injection. When I turn the key on I use to here a the Fuel Pump come on and then a few seconds later after the pressure buildups up it stops. Now I hear the Pump Constantly running. I also hear a hissing noise coming from the Throttle Body near the firewall. My car will not start. The only way to get it started is to spray starting fluid into the Throttle Body. After starting, the cars runs rough. When I put the car in drive and push the gas peddle, the car wants to stall out.

You may also check your fuel pressure module...it is located behind your throttle body, near the firewall. I was able to isolate a vacume leak in that same area with the same symtoms before starting the car, although mine runs an idle ok, it hesitates and will not run smoothly down the road...in my case, it still may also be a failing fuel pump...the best analogy to describe is like sucking on a pop straw that is cracked, you can see the pop comming up the straw, but it's not enough to quench the thirst

Sound like your fuel pump is failing
check the fuel pressure at the fuel rail
should be 35-45psi and you should get about a liter of fuel in less than one minute