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Discussion Starter #1
Hi I have a 93 Toyota supra Na and when I start the car it idles at 3500 -3700 rpm. I let the engine warm up to running temperature but it still remains high. I checked under the bonnet after turning off and I could see a small amount of smoke (smelt like plastic) towards the exhaust manifold.

Note: The battery is low and occasionally one of the cylinders misfired when it used to stay at 1000 rpm
 

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Discussion Starter #2
Problem resolved. My friend plugged in the idle monitor in the wrong direction. Hope it helps anyone with same problem.
 
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