Pretty sure the answer is no

When driving a very slow speed in silence, I can hear a creakk as as my front wheels turn, it's like hearing a rock stuck on your wheel, like the wheel has to spin to a certain spot for the creak to happen. Any ideas?

Need better description. Croak? Like yer choking an old man?

?????

A rock stuck in your wheel doesn't "croak" it goes "tic tic tic tic tic"

Oops, was late last night and I wrote "croak" instead of "creak". There's a medium-low pitched creek I can hear when I'm driving at a very low speed, coming from what I believe is the front of my car. I know a rock makes the tic noise, this is what I was trying to get at: just like with a rock stuck on your tire, your tire has to spin to a certain point for the rock to make contact with the ground and make the tic noise. It seems to be the same case for my creak sound, I believe the sound happens only when my wheel rotates to a certain point.

So it makes the sound at regular intervals as you're moving?

Yeah, from what I can tell the wheel has to rotate to a certain point for the sound to occur, it happens more frequently as I (very slowly) accelerate more. I can only hear it in silence at about 2 mph or so though.

Sounds like it could be the knuckle?

Expanding upon my creaking problem, it seems that it actually only happens when I apply the brakes. Looking at other sites it seems like it might be the pads, caliper pins, or wheel bearing

P0507 - Idle Air Control System higher than normal.

This code has been active for over a month now with the car idling at 1200rpm. Same issue with both the NWP and OEM TB, fairly certain both of them are in working condition. Performed the associated relearn procedures numerous times. 99.9% sure there are no vacuum leaks.

Dealership couldn't figure it out, saying some BS about them not being able to diagnose because there's no coolant flowing through the TB. Which I'm sure is BS since my TB hasn't had coolant flowing through it for the past 4 years. Any suggestions?

For the most part, you will not see any difference on a street car. My buddies would argue that some cheap brands of gas will incur more carbon buid-up in the long run, but which brand is that bad is hard to say. In my area, it really goes with anything related to Arco, which is a subsidiary of BP, even though BP fuel seems fine for the most part. I would think that in the end, it depends on how cheap the gas station owner is with the blend as the Arcos around here seem to try to water down their fuel by adding more detergents and such.

As for grocery store gas, it's like buying a 2 Buck Chuck - you never know what you are getting this time around since these guys seem to contract with random companies. If Krogers contracts with a specific company for it's gas, then I would think you can expect a good consistency.

where is the fuel pump located on 2004 g35x sedan and how do i replace it , thank you.

Under the rear seat. Get a new one and swap it with the old one. Simple search and I found a DIY for a Walbro which you can use for an OEM also.

Replace fuel pump

I can't seem to find if anyone has posted it replied to this inquiry. I've searched threads to no avail.

I'm looking for a replacement grill for my sedan. No matter what search, query or parts site I go to, all I can find is the standard vertical billet grill. I don't want to replace the front bumper just to eliminate the factory grill.

Can someone offer up a site I can go to? And, maybe I should've started with this question, will any aftermarket grill for coupes fit the sedans?

I don't know where the heck you're searching, but I've never seen a vertical billet grill on a G35. But there are some options for aftermarket grills out there.
To answer the question you should have started with, no, a coupe grill will not fit a sedan.
Also, you made a remark about replacing the front bumper... I'm not sure what exactly is the source of that line of thought, but...
first, you don't have to replace the bumper to replace the grill,
second there are very few aftermarket front bumpers that include the grill as one piece... and I'm not sure if there are any for the sedan,
and third, if you're thinking about switching a bumper with a coupe or a different generation sedan (03-04 to 05-06 or vice-versa) that won't work without replacing the whole front end (hood, headlights, fenders, etc...) plus the potential for custom work.