I have an automatic 2010 Infiniti G37X with 331K KM's. I cleaned the throttle bodies and replaced air oem intakes into CZP silicone ones. We did exactly what the several YouTube videos said to do and were gentle with the TB's. The car ran fine for several days until recently. I've done the following resets like I read in multiple threads in various forums in different variations that worked for other people. 1. ECU reset 2. Accelerator Pedal Release Position Learning 3. Throttle Valve Closed Position Learning, and 4. ldle Air Volume Learning (Throttle Position Learning) I've done them multiple times now trying to see if maybe I mistimed it or something but still have the same results. The car goes into limp mode and won't go over 1,700 RPM after a few mins of idling. When I start it cold it seems to not have the issue but comes back like clockwork after a few mins. The codes I'm getting from the OBD scan are: P1233P1233PO198P1233PO507 This is my first Nissan/Infiniti and I don't know what to do. It's my daily and having this issue is so frustrating. Any help, guidance or advice would be great. Please help me!

 

I'd double check the wire connections first
a little W-D helps

Then make sure there's no intske tubing debris stuck in the TBs.
And clean them again, carefully, but not gingerly.
Might just be a sticky throttle shaft.
again, I like to lube stuff after cleaning.
What shape are the air filters in?

Could try swapping TBs, see if the code follows.

No idea about the oil temp code. Trace the wire, check the connectors...
You might need a new temp sending unit.
Did you change the oil recently?