My 88 750 is not even coming close to passing emissions. Besides taking it to a dealer and paying out the wazoo, what are my other options? I am thinking of doing plugs/wires b/c it probably needs them anyway. Any other suggestions? It is supposed to have new O2 sensors. It was my immpression that Cats were either 100% good or 100% bad, no in between. Mine have not overheated or clogged up so could these really be the cause? Any help would be appreciated. Thanks.