ok, I know this isnt a spec-v or anything but it's my g/f's car and has turned into a nightmare of epic proportions!!!

2001 sentra xe automatic.

It has had the check engine light on for the past year or so. I knew it was o2 sensors but kept putting it off for money reasons.

well fast forward to a couple days ago and the car starts idling rough and accelerating quirky, etc.

took it to autozone and had the codes run and they came back as P0430 and P0135 so we just broke down and bought ALL 4 o2 sensors. We had to get the universal replacement ones (2 3wire sensors and 2 4wire sensors) because we just could NOT afford the $650+ for the oem replacement ones.

I got them all on last night and reset the codes and went for a drive. Well the problems were still there. Finally after 30-45 minutes of riding around it tossed codes again. went and got them read and it came back as P0135.

dammit!! the o2 sensors have only been on for like 45 minutes!?!?

so I went back home and since that was a bank 1 code I went into the connections on the two pre-cat sensors and replaced the stupid posi-locks with crimp connects thinking maybe I didnt have a good connection inside the posi-locks.

Then I reset the codes again and went to drive. The car ran "better" this time but still had SOME of the idling problem and acceleration problem every now and then. It threw the codes again.

but by now autozone was closed and I'm here at work right now.

I just need advice on what to check next this afternoon??? I'm going to replace the posi-locks on the post-cat sensors first thing this afternoon and reset the codes and go for a drive but if that doesnt work then I need suggestions guys, her not having a car to get to work is really straining us bad!!