The temperature on the MAF is for the oil temp and the gauge is for water temp.
The cutting out at junctions is what mine did when I purchased it. Check all the breather hoses for splits or tears. Even a pin hole will cause it to suffocate.
Also, give the throttle body a good clean with some carb cleaner.
Have a look at the guides here, plenty about.
If you need a new breather hose, I have a few and happy to help if you are near Milton Keynes.