Alright, I think I have a new one here. Saved a LS a while ago. Long story short it ran well enough until a big rainstorm. Bogged down, ran rough, figured it was ignition. Got the coils swapped out and ran well, except in reverse. Starts up, drive, 1-2-3-4 all work, but the second you shift it into R it dies. Not a stumble and stall, it dies like you turn the key OFF. Instant dead. I assume it is electronic because the LS got a newer computer controlled transmission, but I havent been able to figure out where to start, all my other cars are manuals. Any ideas?