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1994 c4, LT1 idle problems when hot

by Lee Miller
(Warwick, R.I. USA)

I have a 1994 c4 with an LT1 and it has idle problems when hot. It has an auto trans so sometimes when at a red light I have to stand on the brake so it does not take off.The idle jumps around and sometimes has gone up to 1100 or 1200 rpm. If I put the car in neutral or park it still does it. I have no check engine light and no stored DTC's.Does anyone know what my next step in diagnosing this problem might be?

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