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Need everyones thought on this one. My04 S. Over time my idle rpm starts to drop and pulse when stopped. eventually it will throw a PSM and using Durametric I have P2186 Throttle body sensor. I cleaned the throttle body, cleared the codes and she purrs like a kitten. Slowly day after day she will start to drop rpm coming to stop and start the whole cycle again. it takes 3 to 4 weeks. I have checked throttle body, coils, plugs, fuel rail. I don't know what else to check?