122000 miles on car spark plugs are fouling . Could this be the cause? Sometimes it is dificult to start the car in the morning and whaen it starts you smell unburnt fuel out of the tailpipe. could this be what is causing the cat to read this way. I dodnt get a cod for the o2 sensors just the cat. Back in Jan 03' I got a code for fuel mixture to rich and changed the fuel filter. The light still came back on. Could this be a fouled plug? Please help......
