Rough Idle When Cold

[fmansfield444]

I'm having this problem with my 2000 TC, I noticed it a little bit earlier in the year but it went away during the summer. Well now it's back again and will probably get worse since it is getting cold fast. When I first start my car up, it idles pretty roughly, never stalls but it will be bad enough to rock the car. This goes away when i accelerate and when the engine warms up (still slightly noticeable when gauge is between cold and normal).

I have checked my vac lines, all is good, and I have checked for codes which I did get some. P1131, P1151, P0171, and P0174. To me this sounds like an oxygen sensor problem but would they only cause issues when cold? maybe the heater circuit isn't working right? I also am considering an intake leak and due to my car still having the plastic intake I will be replacing that soon anyway but thought I would post this first.

So far I have replaced spark plugs, fuel filter, air filter, cleaned IAC, cleaned MAF. Here are pictures of my scanner and freeze frame data. Any help is greatly appreciated, I want this fixed before it gets really cold and it may start to stall!

[fmansfield444]

Bump.

The car actually stalled today after startup at a red light. I tried giving it some gas and noticed the throttle response was a little delayed, so maybe I have a clogged injector which unclogs when heated, just a guess.

I will probably be tearing into it and checking spark plugs (only 6k on them), re gaping them, checking cops and wires sometime this weekend. Will probably clean injectors as well. I hope it's not an o2 sensor problem because those look like real joys to get at.