AAAHHH, I finally got both me vehicles working and tuned. No over heating and nothing broken. I think this is the first time in my short 2 months of Nitro RC's that I can say that. This is what I have learned.
1. Be sure you break in your RC. I didn't do this with my first one.
2. get a temp gauge. it's easy to over tune and burn up the engine. I did this too with my first one.
3. Don't drive like a drunk. Take it easy and drive smooth. you don't have to full throttle it every where
4. Don't mess with those needles if everything is fine.
5. When it's not running well, get a new glow plug. amazing what that did for me.... on both RC's
6. Don't leave gas in the tank
7. When all else fails and your totally friggin' pissed off b/c you cant get it to run properly, Reset all needles to the factory setting, put in a new plug and BOOM-it all works again.

I am a total beginner, so don't take any of my advice, it's just what I have learned to make my stuff work. Oh, and I now see why you guys have those magnifying lights on your work benches. I wish I had one. Thanks to all you that have helped me.