I just got done doing a valve adjustment and I got this code. I've checked all the hoses, there are no tears in the intake tube, and even redid everything by changing out the intake manifold gasket and cleaning the mating surfaces. When I let go of the gas, there's a slight bucking, with means it might be the IAC. On the V6, there are two hoses running to the IAC on the bottom of the throttle body and they both look fine. My only other option now is to replace the Honda plate gasket on top of the manifold. But besides that, do you guys have any ideas on what to look for? I've performed an idle relearn procedure as well.