Picked up the G35 on Monday, buddy has driven it since, says it hasn't sputtered *yet*.

Only the knock sensor & harness was replaced, O2 sensor is new and awaiting installation.

Connected to it via Dashcmd and the OBDII adapter, fuel trim information is below:

Idle ST: +0-6%; LT +11%
1,000 RPM ST: +10%; LT +11%
2,000 RPM ST: +24-25%; LT +1%
3,000 RPM ST: +19-24%; LT +11.7%
4,000 RPM ST: +0-5%; LT +9-11%

These %'s look very all over the place.
Maybe it's the adapter (doubt that), could borrow AutoZone's reader, but...

Fuel injectors? I would suspect much more rough idling if it were fuel injectors.

Shop said the O2 sensor was very finicky, maybe it's just failing?
Would it be best to just replace all 4 O2 sensors or is that just plain overkill?

 

You should have both banks showing the fuel trim levels and how long are you revving it for?

 

I figured the ST was one bank and the LT was the other.
Held the rev at that RPM, until reading was taken, then increased/decreased respectively.

 

So I recently went threw this problem as well I have an 03 g35 sedan and I changed valve cover gaskets air intake gasket all coils and plugs and replaced the cam shaft sensor but from what all my buddy's tell me and from experience I've replaced my bank one cam shaft sensor 3 times in 2 years and every time I change it the ideal is normal then about 5 months later it happens again I just made sure to get the part with a life time warranty and bank 2 sensor really never goes bad just an FYI I bought my g at 88k and it's not at 144k might sound dumb but I've put about 5k into repairs and all the repairs except sensors have been oem so I love this car