im so confused

[89 coupe]

ok so my car has a high idle. around 1800rpm. ive checked my tps, iacv, coolant temp sensor and timing. there all good. i just did my plugs and wires. my speed sensor is toast so i decided to unplug it because it was adding up some km when i was just idling. after i unplugged it my car was idleing at 750 rpm. ran good and everything. plugged my speed sensor back in and it went back to idling at 1800rpm. what does a speed sensor have to do with my idle? it is confusing as hell

[GODCHSR]

Not sure what it has to do with it BUT it sounds like the problem. Replace it

[Wc240]

check your harness and wiring. mabe you got some cross wires.only one post is needed

[the converted]

There is a rolling idle that is different from your stopped idle. If your speed sensor is adding mileage, then that might be the problem. I would take a meter and double check the function of the sensor before you go just changing it out in case it is a wiring problem.

[badass_s13]

you could get a programer that might solve the problem but those can get pricey

[Wc240]

thats like putting a bandaid on a flat tire. you want to fix the original problem, not cover it up