Misfires On all Cylinders - Help

[cruzanrs6]

Update:
So I found the drivers side pre cat 02 sensor wiring appears to have shorted (his was on harness mating connector that was replaced some years ago by dealer). Also found some of the small 3mm vacuum lines that were bad off the combi valves and some other. SO all was fixed. I also ohmed out the O2 sensor against a new one and the pass side one and all checked out. Fired up car last night and drove it - no more CEL, running better at idle but still some misfiring. After drive scan said misfire detected on 6,5,4,8. Reset again, fired up another drive scan shows 5, 4 misfire (no CEL). Drove to work this morning, great power under load still slight mis (more so when left in park), when stopped at light/traffic (not really anything). Did another scan at work (still no CEL), shows 5 and 4 BUT also 4 system to lean codes - intermittent and both 02 sensors (Bank 1 and 2) 0 Malfunction in circuit - intermittent.