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Engine idles at 2000 rpm when hot, coolant comes out of overflow, no codes

(2001 Cadillac Catera)
in Ossian, IN on September 09, 2012
when more load is applied to engine the idle returns to normal but gradually increases to 2000 rpm. checked for exhaust gases in coolant, negative
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Popular Answer
of Greg's Orange Auto on September 09, 2012
suspect vac leak 1st then poss t/body sticking
on September 09, 2012
have you tryed the throttle positioning sencer
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