What did I break ?

[Hypersprint]

I recently bought a used E-Revo with a 4s Lipo, Quark 125b and a Nemesis 7L motor. When I ran it the ESC and Motor would get to hot to touch, this was only hitting full throttle a couple of times each run since it was a wild ride at that speed. Since a lot of you don't seem to have to much trouble with heat I was wondering if there is a problem with this configuration.

My Big Problem:
The last time I was running I hit the trigger hard enough to flip the truck on its back and when I flipped it over it could barely move. I could hold it in place and hit full throttle and the truck would try to move but could not. I took the pinion off and hit full throttle and the motor would rev up and down at all kinds of different speeds without moving the trigger. The first thing I did was a basic check of all plugs and connections without finding anything obvious. Have you seen this before? How can I test the ESC, motor, battery etc. I'm not new to RCs but I am new to brushless and I am hooked.

Thanks
Rob