Notes: ATTENTION: Click on Bulletin(s) for testing instructions. It is best to test your old parts first. Wells Test sheets are available for most ignition modules. A misfire condition can destroy the ignition module. If the engine is or has been misfiring, do not install the new ignition module until after the source of the misfire has been corrected. Check the secondary ignition circuit; Plugs, Plug Wires, Coil(s), Distributor Cap and Rotor. Also check for any camshaft position sensor trouble codes.