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Unfortunately, as detailed above, I've been through all of that.

Bumping this thread now that I've had some time to look into the injectors and everything seems fine. Summary at this point: If the jeep has been sitting for a day and I go to start it - I turn the key to power, hear the fuel pump prime, then turn for ignition, and the first turn always...

Hey thanks for chiming in! The pump is good, tested pressure and behavior from the rail and everything checks out. The idea of an injector leaking into a cylinder over time and making a stumbly first start is very interesting though. That brings injectors to the top of my list of things to test!

(By ignition wires I should say the battery harness, high gauge replacements, wing-nut style terminals, all the usual)

All ignition wires have been replaced with new cables, clean grounds across the board. The other thing that makes this suspicious is that after that initial crank, it starts every time. No hesitation, no weak crank. It's not like the plugs fire off of a starting capacitor...

97XJ, its been doing this for as long as I can remember. Jeep has been sitting for a day - you go out, turn the key, it will crank and sputter if you hold the key down but it will never start. Same behavior if you turn the key to prime the fuel pump and then turn to ignition. If you back off...

The idea behind a relay is to keep you from running high amperage through a switch. This means you can use lower gauge wires, the switch can be located further away from the power source, etc etc. With all that in mind, your battery/alternator provides a 12V power source - that's where you're...