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Diagnostic Help Needed

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I have a 1998 sc300 and the idel bounces between 0 and 1500 RPM but only when the tempeture is over 85* any tempeture lower then 85* and no problem. with idel

I was thinking it was the mass air sensor but the problem only occurs in hot weather.

Is there some type of tempature sensor that controls this?

Thanks Scott

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