CAN ANYONE OUT THERE HELP ME, I BOUGHT A 1996 VOLVO 850 2.5 10V AUTO A MONTH AGO, SHORTLY AFTER I TURNED OFF THE IGNITION AND THE ENGINE RAN ON FOR A FEW SECONDS, AT THE NEXT FUEL FILL UP I PUT IN A BOTTLE OF INJECTOR CLEANER THAT CURED THE PROBLEM FOR ABOUT 1000 MILES BUT NOW THE RUN ON PROBLEM IS ...