2008 CS Rough Idle
 

So I've searched and searched and haven't seem to find the answer I'm looking for. A few weeks ago I got an O2 bank 2 sensor 1 code. Figured it was bad gas or dirty injectors. Ran some cleaner through it and a few fresh tanks. This week it started idling rough and surging in park and drive at a stop. acceleration was good so I pulled the codes again. Had a misfire on cylinders 4-6, random misfire code, O2 still cam timing and such. Changed the plugs and coils and air filter. Now the surging is worse and lagging bad while driving. Throttle response is weak and almost sounds like a blown cylinder when accelerating. I've checked the plugs and check the coils and all are good and seated. Checked the connectors and they are all pressed in firmly. As I've seen some talk about the battery I have checked it. Voltage was a little low so I've got the charger on it boosting it back up. This all started about the same time the temps out here started to drop. Also checked the gas cap and that looks fine as well. Cleaned off the seal on it and made sure it was tight. I've built plenty of cars in my life and tuned as well but this has me stumped as to why the idle and acceleration has gotten worse since changing the plugs and coils and air filter. Any suggestions are welcome. Here are the codes it was throwing before I did that work.


P2254
P2a03
P0442
P0014
P0300
P0305
P0304
P0306

Still throwing the P2254 code and a P0017. I doubt the cam sensor is bad and with the surge in idle I'm sure the computer is trying to correct the timing the best it can do. I haven't changed the O2 sensor yet because after seeing the plugs and coils I don't think the O2 is bad just been reading a bad mix coming from those 3 cylinders.

Thanks

Check your MAF's

Agree on checking the MAF's .