2004 nissan sentra spec v 2.5L

I HAVE A IDLE CONTROL PROBLEM IT REVS UP AND DOWN WHEN THE CAR IS WARM WHEN ITS COLD IDLE IS NORMAL IVE CHANGE THE IDLE CONTROL VAVLE AND BOTH O2 SENSORS I HAVE NO VACCUM LEAKS WHATS ELSE CAN I DO I DONT WANT TO GO TO THE DEALER COST TO MUCH