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The car is a 78 280z with an L28ET swap. I was going over the wiring as I do every year before putting the car on the road and was doing some tests when I noticed something strange with the TPS. The tests all check out as per the fsm. I tested for continuity when the the throttle is open and the switch loses continuity as it should. Tested that at the switch and at the ecu plug. All good there but I noticed when I unplug the tps sensor at the sensor while the car is idling nothing happens to the idle. If I'm correct the idle should change when the switch is open because of different fuel enrichment.  Any ideas? Thanks.

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