The (EVR) voltage regulating circuit is in the Power train Control Module (PCM) and is not serviced separately.
OK it looks like you are loosing milli volts passable some milli amps, between the alternator and battery. This could be bad connection at the battery or the alternator.
Try somthong check the voltage with the engine at about 1,000 RPMs.
Voltmeter Testing the TPS
A sensor can be tested with a voltmeter while its electrical wiring is still connected (this is called back probing a connector). Move the throttle slowly from closed to open. At different throttle openings, varying resistances are specified. Watch for any glitches.