There is a knob beside the headlights under the hood, fairly good sized, looks like rubber and you can manually turn down your headlights. That happened to my 86 Supra last year and the sync was just off and once I turned them down they started working perfectly. Hope this helps
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I would think that the TPS is not adjusted correctly. Move it until the idle stops fluctuating and advise how it runs.
The TPS does 2 things...It tells the computer the opening of the throttle plate, and it also sends a signal to the computer when the throttle plate is closed. If the TPS has the closed throttle switch activated, and the throttle plate is open, the ECU will fluctuate the idle up and down.