A friend of mine with a 91 or 92 had the kid at the gas station pump gas into his tank... . ( In Oregon you can't pump your own gas)... . It started to run rough, coughed and died at stop lights... . He kept it running at stop lights by putting it in neutral and flooring it... . He figured it was a fuel filter so he got a new one and changed it and dumped some Marvel Mystery oil in the tank... . It ran better, so he finished his deliveries: He delivers cords of firewood..... He checked his receit that night and discovered the problem and drained the tank..... That was two weeks ago... . It seems to be running fine, but he wonders if the engine was damaged in some way???Any ideas??? It has about 180K on the odometer... ...