Whatever you said while at the Infiniti dealership obviously convinced them that they did not want you as a customer.
Easy to understand after reading this thread.

Telcoman

 

I have no idea how to help the OP, but I believe this could have been solved awhile ago just by simply following directions. Pay to get a proper diagnostic (IDK what Inifiniti did for $200, but that was a waste of time and money) and you can pinpoint your issues.

That service adviser certainly isn't fond of you if that's all you got.

 

Infiniti gave him the trouble codes. He chose not to authorize any additional work.

The OP obviously pissed off the Infiniti Service advisor?

I have the four volume paper version of the 2006 FSM that I purchased shortly after i purchased my first Infiniti.

There is extensive substantial troubleshooting in the EC (Engine Control) section with all four of those trouble codes. The Accelerator pedal position sensor has two sensors.These sensors send an output voltage to the ECM. The ECM uses these signals for engine performance operation including fuel cut off.
When a malfunction is detected this can put the engine in fail safe mode.
There are two ground connections that need to be closely inspected and cleaned and tightened.There are wiring harness terminals and connections that need to be checked as specified in the FSM page EC 597

The OP is being a complete dick for not obtaining the required FSM and following the logical troubleshooting steps. A consult tool is required for some of this troubleshooting and no dealer works for free especially with someone that calls/refers to the dealer a "stealership" They will usually bill this type of customer more or may not to even want to deal with a customer like him?

Good luck to the OP in getting his POS vehicle properly repaired.

Telcoman

 

Hey hey hey let's not get too offensive this IS a G35 forum after all :P