Still Having Misfires After Diagnosing Everything | AskDap

Q - Hello I've been having issues with check engine light problems. I have an CTS blow off valve, a CTS cat back exhaust with stock downpipe and muffler delete off the exhaust, and resonator delete. I've been getting a P0304 and now I have both P0304 and P0303. I've replaced all of my ignition coils, spark plugs and fuel injectors but I'm still getting misfires from my 3rd and 4th cylinders and I'm also getting a P2308 and a P2311 code which are the Ignition Coil C secondary circuit and Ignition coil D secondary circuit, beings though I replaced all of the simple parts that cause a misfire, what else can it be? I've been dealing with this problem for almost a year now but I just don't know what it is and the Volkswagen dealership can't pinpoint where the problem is coming from.
10mm Flat Wrench for MQB Ignition Coil Nut
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Deutsche Auto Parts Inc.
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