I have an original '81 Ram Sweptline with the Slant Six/auto & 51k. Cats are gone - all else is to factory spec. When it rains, the ignition shorts out, killing the engine. A hard knock on the box with my fist will usually get it back running. I've heard there is a more reliable system that replaces the lean burn completely. Does anyone know what what might be and where to find it? Thanks.