hey supra mk3 my 89 turbo is doing the exact same thing with the idle... it comes down sometimes after a quick off and on after worm up but other than that its exactly at 1800rpm in park or nuetral and about 12000 in gear. I just bought tune up parts like belts plugs filters ect... the car runs great other than that with 164000mi. so hit let me know some of the things you did if you solved it.
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