2002 Chevy Tahoe IDLE PROBLEMS

WHEN FIRST START ENGINES IDLE AROUND 5 THEN STARTS IDLES UP AND DOWN, AFTER WARMS UP SEEMS TO IDLE FINE TAHOE RUNS GREAT NO MISS NO STUMBLES I DO HERE HISS AROUND PCV PULL OUT PCV FROM HOSE ENGINES RUNS REALLY ROUGH LEAVE PCV IN HOSE PLACE FINGER ON BOTTOM PCV FEEL BALL JUMP UP INSIDE PCV. CHANGED FUEL FILTER & AIR FILTER PUT IN GOOD LUCAS FUEL TREATMENT. ONCE A WEEK CHECK ENINE LIGHT COMES ON THEN GOES OFF A DAY OR SO LATER AUTOZONE CHECK IT SAID IT WAS O2 SENSOR BANK 1 AND BANK 2 ANY IDES THANKS