2002 Honda idle problem

2002 Honda Accord V6 EX - just started idling roughly yesterday. Idle runs from about 900 to 1900 and bounces back and forth rythmically over a period of about a second. It occurs soon after starting and continues. At first there was no "Check engine" light but after taking it for a test drive (WIfes car) and turning on the A/C, the "Chech engine" light is on and the 'TCS' light stays lit. Also the rythmic bouncing of idle is 3 times as fast, fluctuating from about 1200-1500. I think it might be the Idle Air Control Valve, but the local shop wants almost $100 just to check it out. After that is all the parts and labor. The car has 110,000 miles and has always been dealer maintained. The last trip the mechanic said "boy you really keep this car in great shape!". Any pics of the Honda V6 accord motor showing the IACV location? It was easy to find the MAP sensor. There are so many sensors on the Honda, I don't want to just replace them all! There is a sensor on the top (Clearly marked 'MAP sensor') one on the front side towards grill, and one on the bottom of intake. There are also several others. The one on the bottom has a couple of 5 star Torx looking screws. Are they trying to really prevent us from changing that one? Any help in figuring out which one is the IACV if that is the culprit? I sent a couple pics. Thank for any help.