I have a 2009 Outlook with 125k on it. While driving at 45-55 MPH (cruising) the engine light comes on flashing. I took it to my local shop and it comes out as a Cat issue. I put 2 cans of SeaFoam cleaner in the gas tank and it cleared up the issue for about 1,000 miles. I don't want to keep dumping seafoam in every few tank fills. Has anyone else had this issue and it it really the cats or bad O2 sensors?