Have you done any diagnostic work, or is the fuel pressure problem just a guess? Before spending money on a pump/regulator(about 300 bucks, I think) put a pressure gauge on the fuel rail. Have someone start it and watch for a pressure drop. If you see a big pressure drop, but it doesn't drop to zero, it's a feed/pressure issue. If the pressure drops to zero, the pump is shutting off/not supplying fuel with the key in the "ignition on" position.
A low pressure condition usually allows the engine to idle but it bogs down/cuts out when you rev above a certain throttle position.
My bet is either pump not running or the above mentioned SKIM module not disabled.
"Never attribute to malice that which can be adequately explained by stupidity, but don't rule out malice."
My other car is also a Jeep,.. and so is the other one,.. and that one too. How many do you own before it's "a herd" ?