hi everyone... my sister has a 99 Taurus SE with a 3 liter v6, the other day, it stalled and would not restart for her... i ran it for codes and it came up with P0175 saying that bank 2 was running rich... i was unable to find much in the way of direction of where to look for the cause of the problem, we cleaned the pcv valve but it seemed like it wasnt seating properly.... we got it running, cleared out all the codes, she drove it for two days and now is describing a misfire to me.... im totally clueless on this one... any and all ideas would be appreciated thanks