NEED HELP, P0150 code AGAIN

OK, I had a P0150 code and went ahead and replaced all 4 O2 sensors. I had previously replaced just the fwd r/h sensor for the same code a few months ago. Since the code came back I went ahead and did all 4. Is there another sensor that the computer looks at or that could be giving it a false input. I changed the MAF sensor, crankshaft position sensor and the plugs/wires about 6 months ago or so. At that time is when I did the initial r/h fwd sensor.
The SES light came on today after about 20 min of driving after all 4 O2 sensors were replaced.
Any help would be great, I have a 12 hr drive from AL to TX in about three weeks!!!
Thanks
Rob (01 DII, 99K)
:banghead:

Also my OBDII reader has a live mode to look at everything while driving/running, is there anything specifically I should be looking at?

Alright, this morning came out to a P0174, too lean code, cleared it and no more SES light. Ran live data on my scanner while driving and had the following for the O2S:
O2S B1S1 (v)- 0.55 varying to 0.800
STFT B1S1 (%)-0 varying to 3.7
O2S B1S2 (v)-0.445
O2S B1S2 (%)-NA
O2S B2S1(v)-0.035 varying to 0.050
O2S B2S1(%)-25.0, would vary from 0-25
O2S B2S2(v)-0.445
O2S B2S2(%)-NA
These were as best I could tell while driving/idling, the scanner also ended up with a P0150 code but no SES light.
Any help would be great!!!
Thanks