99 wrangler hard start

As billy ray said, a leakdown test is in order for sure. I bought the Hanes Manual for about 18 dollars at my local Advanced Auto Parts, probably a good idea if you plan on doing work on your vehicle in the future. A good way to double check and make sure its a fuel delivery problem is to depress the schroeder valve a couple of hours after the vehicle is shut off, and see if there is pressure (which there should be if you didnt have a problem).

There are 4 possible things that can go wrong causing the fuel system to lose its pressure when the vehicle is turned off:

2) Leak in one of the fuel injectors (you can test this by removing the fuel rail and the injectors (its all one assembly held in place by about 3 screws i think) and then turning the key to on a couple of times (NOT START) and then you can check for drips from the injectors because there should be none

The other two possible problems are as follows: You will need a fuel pressure tester to test this....I bought one for about 8 bucks at Harbor Freight. You can attach the tester to the schroeder valve in the fuel rail. Pressure should go up to about 45ish PSI when you start the vehicle. When you turn the vehicle off, it should stick to around the same pressure. Anything under 30 PSI after five minutes is unacceptable.

Thanks to bill for posting the entire chapter on fuel delivery from the FSM:

No, I'm saying the PCM adapts to CURRENT conditions. Even under load. It will default to open loop under WOT conditions, but you're not getting 25 mpg if you spend most of your time with the pedal to the metal.