OK, Bought a 07 with a couple problems today.

[SpareParts]

Yes, a new o ring also with a new pump.

 

[mikeyss]

I think i have a plan for the oil pressure and rough idle. Seems like a good plan anyway.

This weekend.
Change sender and check for screen.
New Plugs, wires.
New intake gaskets.
New valley cover gaskets.

If that does not fix it then the next weekend will be,
New oil pump. Milling 10355HV. Maybe new VVT stuff. Its not that much and im in there already so.

If that does not fix it i will have to assume the motor has bad bearings and will replace the engine with a 60day warranty wrecking yard special.

I just installed the same oil pump you've listed and my oil pressure at cold idle is 60psi, and hot idle is 35-40psi. Long story short, my oil pump was replaced when I built my motor a few years ago, and it was an AC Delco replacement. It 100% failed on me with less than 30k on it last month. Luckily when it failed, I was home.