Im with the rest of the guys, you have to get that plug out and inspect it. Let it soak in some pen lube and try working it back and forth as youre removing it. The 1kohm youre getting could be do to some of the other components that share the common power to the injectors. Check the wiring diagram and unplug all the components that share the same power supply as the injectors. If you still get the 1000 ohms you have the oh so fun task of finding a voltage drop.
......And just as they're about to catch me.....Twin......Turbos......Kick.......In!