Mike2000Z28

Can't figure out what is wrong with the Secondary AIR system, the pump is working and I can't find a leak anywhere, I'm still getting the P0410. The is getting more and more often sluggish and surging when partial throttle and under load. I just recentally replace both O2 sensor and had the P0140 DTC turned off. I'm going to look into the AIR system this weekend and alot of the other minor things (plugs, pcv valve, even some of the wiring, also fuses).

Should I be looking for anything more or go play with the tune?