okay, my b16 is knocking, i think. at idle, every so often, theres like a putter and the rpm drops like 100...is this considered knocking? heres the thing, my distributor is almost all the way advanced, and when i try to bring it back to tdc, it starts puttering even more. i have a field vafc, so is there a way to change the fuel ratio so that the puttering stops? should i make it richer of leaner?