Update with a happy ending...
So I posted this thread on many lexus blogs and several people responded that I should consider checking all the fuses. One thread suggested looking at the 30 amp AN1 fuse under the big cover in the engine area. That exact fuse was dead. I researched the circuit for that fuse and it controls the ignition including the spark plug coil. I replaced the AN1 fuse and the GX started right up but died in seconds and the fuse was blown again. It also sounded like I had a leaking exhaust manifold on the passenger side. I immediately noticed the spark plug #2 from the firewall on passenger side was coated in soot. I removed the 10mm bolt and pulled on the coil assembly and the top coil box broke away from the coil shaft connected with a tail of copper wire. I pulled on the wire and the rest of the coil shaft assembly came out including the spark plug. Thats right, the spark plug was not screwed in to the head. I replaced the coil pack with a NAPA part, added a new iridium plug, added another 30 amp fuse and it started right up and remained running.
This fix ended up taking about 15 minutes and under $100, a big win win. But how in the hell did that plug get so loose. The odor I smelled was the exhaust melting the silicone boot and plastic housing. I ran codes and it came back as a spark plug coil.
How awesome is it that I know not a lot about cars and a few hours on the internet and helpful suggestions from people all over got me back on the road - THANKS to all who helped.