So I my g35 03 is in limp mode with a p0102 and occasionally a p0113.
I have swapped the maf and even checked it on a Sentra which uses the same maf and it works fine. I also cleaned the maf and throttle body.
I'm hoping someone else here knows where I can go from here and any possible solutions.

 

That's odd, both errors are your MAF sensor:

P0102 - Low MAF output voltage
P0113 - High IAT signal (also part of your MAF)

I would break out the FSM and check voltage at the MAF wiring. I would also use a scanner and see what grams/sec or voltage your MAF reads and if it changes with throttle. Sounds like a wiring problem if you have already swapped the MAF sensor.

 

Unplug the harness and inspect it, if the code doesn't go way replace the MAF. You don't need to buy the entire housing, if you get just the sensor it's a lot cheaper. I think the Hitachi part number was MAF0031 and the sensor itself is around $50 usually.