Flashing P030* DTCs are a huge no-no with this engine.
What is the mileage of the car? If you have no record of the maintenance history, the absolute first thing you should do is get all cylinders borescoped, a compression test and leakdown test done.
If the combustion chambers and intake valves are excessively crusty with hydrocarbon deposits, have a walnut blast job done.
Factory ‘13 spark plugs are way too hot. Replace those with HKS M40XL plugs gapped to .028” and if over 45K miles, replace the ignition coils
as well with OEM.
Let’s make sure the ignition system is healthy and combustion chambers are relatively clean before replacing fuel system parts.
An aftermarket fuel line is much cheaper than a HPFP. After the health check is done, I’d like to see a Torque Pro (TqP) log of a full throttle 3rd gear pull from 3000 to redline.
Until this gets properly sorted, do not put high load on the engine by applying even moderate throttle in a high gear. Otherwise, you’ll eject a piston or two through your block.
This is exactly the type of stuff I envisioned seeing when we went through all the common problems 4-5 years ago. It is very apparent that the prior owner(s) did not do appropriate maintenance.
Thank you very much, this is the info I was looking for. I will be getting a manual for this car in the future (I see PDF versions available for a reasonable price), but since I just bought it, I don't have one yet.
No need to buy anything.