P1519 appears 2 times so 1 code down already.
Very unusual for one bank to have an "oppisite code" from the other (P0171 & P0175), one lean and one rich.
Both codes likely due to the same fault. Count as 1 fault.
P0316 and P0306 go togather so 1 fault here. 316 is detecting the #6 cylinder fault at cranking time.
You have only 3 area to address.
Fix the cylinder miss first and 316/306 will clear.
The 171/175 codes may be related to the intake/runner/manifold control issue.
A good tech will take these relationships under consideration and solve for interelated fault causes.
I think they are mostly out of your present ability to handle.
Good luck.