1988 Toyota Supra engine idle

1988 TOYOTA SUPRA
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EARL INDIAN
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Engine Performance problem
1988 Toyota Supra 6 cyl Two Wheel Drive Automatic

engine idle at 1000 rpm up to 2000 down to 1000 back up to 2000 unstable i changed the oil washed the motor have not been able to correct the idle impossible to drive have drided everything out it has been a month have blown with compress air every hose going in to throttle body no blockage i think

1988 Toyota Supra

Updated this is for Bob & Ken you said to remove the idle air control valve in my repair manual it is called a idle speed control valve (isc)
i hope this is the same thing i did remove it from the vehicle and cleaned it i also tested the throttle position sensor and airflow meter which are in repair manual specs what next
Nov 26, 2008 at 1:16 PM
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RASMATAZ
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For a start remove the idle air control valve and clean it out-Test the throttle position sensor and airflow meter using the repair manual specs then comeback with results this is where we start to find this culprit.
Nov 26, 2008 at 3:20 PM
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RASMATAZ
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When was the last time you had it tune-up ?

Check the fuel pressure with and w/o the pressure regulator, PCV and EGR valves and vacuum leaks-Test the oxygen sensor and fuel injector/s
Dec 2, 2008 at 12:37 PM
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RASMATAZ
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If above checks out could be the idle air control valve itself even if its cleaned out if it continues to surge-
Dec 2, 2008 at 12:48 PM