john yerxa

have 01 SS, 65000miles, ran great, gutted cats and installed 02 sims, started with blue smoke when idling. When I start off with not enough rpm or when entering my garage I always rev and spin then stop, I get a puff of blue smoke. I had the seals done on one side because cyl 5 compression was around 180 and plug was fouled. Seemed to clear up but started back. I put new cats back on with the 02s back in and seemed fine for awhile, now doing same thing. Can bad 02s cause the problem? How can I test 02s?
thanks