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Applying the brake may provide a ground path between the engine and frame.
I once had a car that the engine was just replaced. The the engine temp gauge would show a rising high temp until I pressed the clutch. As long as the clutch was pressed (which stretched a spring between the engine and the frame) the gauge would indictate correct temp. The mechanic found that they had not reconnected the ground strap that ran from the frame to the engine block.
In other cases I have found that any peculiar "cause and effect" electrical problems to be grounding problems.
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ComputerChips 
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