Truck is shaping up nicely, but still a few things I need to get finished. Like the heading says, the truck pings on acceleration. Not badly, but enough to warrant a look-see. Idles steady at 750 rpm. New plugs and wires. Getting new cap and rotor. I don't think this would have anything to do with it, unless these 3.9 motors are really sensitive to plugs and wires.