92 GA V6 heating, low pressure, died, wont restart

Hi
I have a GrandAM 1992 SE V6 3300 with 198 000km (123 000miles)

My car temperature was between the 1/4 and the 1/2 (ofter closer to the 1/2)since 20min.
and the oil presure gauge was between the 1/4 and the 1/2 (normaly always after the 1/2)
My car's normal temperture is the 1/4 and little bit over.
The redzone is after the 3/4

I drive over a mount up and down (2-3min for going up and 2in for goign down the mount)
then i make a tight U-TURN, the tire had make some noise while turning, the car shake strangely on the direction (little bit different like when it slip) :confused:
after i took a little curve and the car shaked like before
and then i drive back over the mount the car re-shaked while starting to go up and the the engine died.
the car's temperature was a little bit before the 1/2

I restarted the car, the car started well but there was little knocking sound near the engine
I put it on the DRIVE, the car die, retry, die
I put it on the Neutral, the car was running well, and the put it on the drive, the car died again
I put it on the Reverse, the car died.

i went to see under the hood,
the big radiator hose in front of the engine was hot.
the radioator stopper was hot too.
i checked the oil, the was missing one or two dots, and the dipstick was hot too.
those three piece were really hot(i wasn't able to hold the more than 2 seconds).

i let the hood open and let the engine cool down for 10min
restarted the car, put it on Drive, the car was still alive!
i drove back home, everything stayed normal.

but the engine's temperature was still between the 1/4 and the 1/2.

Here's a list of the thing that i know they need to be changed

-the radiator is leaking
-the 4 shocks need to be changed
-One engine support is broken

Also, the car is very humid, there may have something leaking inside the car
and when the transmission is on Park, sometimes, the rpm goes up and down.

does anybody have an idea of what has happend to my car?
was the car overheating even if it wasn't in the red zone?

thanks a lot :confused: