Planning on putting '05 MSM Engine and Tranny in my 2000 LS, but I'm lacking an ECU. From my research, I've learned that I have to have an ECU, immobilizer, and lock w/ key all from the same donor car; otherwise, my beautiful new engine will not run. If you have these item, know where I can find them, or just have some good advice for the swap please let me know.