Start by checking for diagnostic fault codes. Next, it may be necessary to drive the car with a scanner connected to see what the Engine Computer is seeing. Most scanners have a record feature that allows a few seconds of sensor data to be recorded. It can be played back slowly later to see what took place. The fuel supply system is not monitored, so if nothing shows up on the scanner, you might suspect the fuel system.
It's important to understand that nothing related to the engine will cause you to lose the brakes. You may lose the power assist if the engine stalls, but that just means you have to push harder on the pedal.
What do you mean by "locks up"? Do you mean you press the accelerator pedal but the engine doesn't speed up? Or it stalls completely and you have to shift to neutral and restart the engine?
What is taking place when the engine overheats? Are you stopped in traffic or driving at highway speeds? Does the radiator fan turn on?
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Tuesday, December 3rd, 2013 AT 7:18 PM