The Fram instructions aren't really that clear. The illustration is rudimentary at best. The written directions only say to remove the plug behind the exhaust pipe and screw the fitting in. It may well have nothing to do with the distributor valve. Sorry if I muddied the water.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.