When i start my car after it 've been warm up, it idle real rough, If i step on the gas pedal to raise the rpm to about 2000rpm then let go of the gas it idle just fine. It idle fine in the morning when the engine is cold. I already replaced the AAC Valve, Cylinder Head Temp. Sensor, Spark Plug, Wire, Cap and Rotor, Exhuast manifold Gasket. There is no vaccum leak. All injectors working fine too. What else could I check for? Thanks for all your help.