Question about 1987 Toyota Supra

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Car starts up at 2500 rpm and does'nt go down when it warms up, i change the isc and thats when it started. any suggestiopns

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If the ISC is bought brand new even though its new could go bad meaning it could be defective from the manufacturer from them from the start. You should also use a timing gun to check to see if the timing is where it should be at at idle speed of car. you could also use carb cleaner where it might be sticking at.

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old post
all do, everyone. but. the devil really is in the details with EFI.
this IAC valve does that,
to speed it up warm up , put in a 195F thermostat.
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