V8 Troubles

[Andrew.Schnellinger.B@BAYER.COM]

 I have a 90 V8 and recently i have been having stalling/stumbling
problems. First i thought it might have been some bad gas, but now i think it
might be the 02 sensor. I replaced it about a month ago due to surging
problems. Those went away after I replaced the 02 sensor but now i have the
engine stalling sometimes. I cleaned the ISV after it happened the first time,
idles great the rest of the time though? Stumbling has happened on two
occasions now. Once a  couple of days after replacing the 02 sensor, and now
about a month later. If i floor it the stumbling goes away? I pulled the fault
codes and this is what i got. I dont have my manual handy so i was hoping
somebody might have this info. handy. Codes are as follows: 2341,2342,4431.

Any thoughts, BTDT?

TIA

Andrew
'90 V8
andrew.schnellinger.b@bayer.com