Hi, the mechanic clean the TB as a part of a maintenance process, after that, I have no obvious problems like rough idle or something like that, but when you push the throttle full, the car doesn't have the same power at all.
I clean the Maf, check for leak, and nothing
The only thing i found is 2 cel codes
P1273 (Af sensor on bank1) and P0328 (Knock Sensor)

 

ouch. sounds like the mechanic did not know to reset/relearn.

http://www.nicoclub.com/archives/g35...-learning.html

you need to relearn the ecu \ throttle and idle air. this needs to be done every time you touch the maf\throttle body. I would find a new mechanic as well.

 

Without the relearning it makes sense that those cel appear??
Ill try one more time to relearn but I previously try and it doesnt work, maybe im doing it wrong
I even take out the battery from a entire day, im not sure if that help too

 

I Know this thread is old, but as a feedback, the problem was the Knock Sensor, for a reason it fails to work just when the mechanic clean the TB, just replace the knock sensor and everything goes back to normal. Huge power loss, no visible Code.