I just want to put this out there. For the longest time I had the annoying p0093 error code and the Jeep would go in to limp mode often. I spent countless hours troubleshooting and online forum surfing.
The symptoms were as follows. Runs fine cold. Once it warms up, it gets bad gas mileage(21-22.5mpg), limp mode often(always at the worst times), sometimes ran hot, smokes under hard acceleration, sometimes a rough idle.
It cranks for 3-5 seconds before it starts and considerably longer when cold.
I had the engine and transmission re-tuned by GDE. I also replaced the whole filter assembly with the Racor 2 micron. Through some research I found the 10 micron stock filter may have been too large for the injector jets which could explain the clogging for some. I installed things like a lift pump, and replaced several sensors on the engine. None of this made any difference.
One day the engine went in to limp mode as usual and for the first time it threw a code "cylinder number 1 misfire". I ordered two injectors, 2 copper washers and 4 rubber seals. I replaced injectors 1 & 4, also replacing the injector seals on all as well. The warm crank time kept getting longer and longer. I have read about people on here with the warm start issue and I can tell you it is injector related. With the fuel filter aside, there is nothing wrong with our fuel system. I am confident that if a 2micron filter was used, we wouldn't be having 1/2 the issues.
The end result is the jeep starts immediately every time with in 1/4 to 1/2 second. No smoking at all. Averaging 26mpg now. No limp mode at all. No codes have been thrown since replacing injectors.
I no longer leave the windows down with keys in the ignition or have thoughts about ghost riding it in to a rock quarry. I hope this helps anyone with the P0093 issue. Injectors fixed mine.