After filling up at the station on the way to work this morning my car lost all acceleration and the fastest I could get it up to was 20MPH. I managed to get it back home and call in to work. I spent the day researching online and trying different things to get it running again. I replaced some vacume lines and I cleaned the spark plugs they were fouled up with black soot. I cleaned the contacts on the spark plugs and lubed them up with some anti-seize compound and some di-electric grease for the connectors. I rented a ODBC II code scanner and I read a Muliple misfire code P0300 I think it was. Ever since I got it home and at this point it will start but it will die again after a few seconds of running. Giving it extra gas only causes it to stall sooner. Right now the ODBC II scanner is showing no errors. The DI has been replaced in 2001 and in 2004. I recently installed a new fuel pump, fuel filter, and spark plugs. Any ideas?