Do you have the VTM (blue)wire hooked up? Having that disconnected accounts for a lot of V-AFC problems, since it's not listed in the older manuals. If it's not hooked up, you can download the newest V-AFC manual, or the revision from A'PEXi's website. If that's not the problem, what is your VTEC engagement set at? If it's too far away from the stock engagement point, that'll sometimes cause you to go into limp mode as well.