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Hello All,
Just to keep those who've responded and those who may be curious about the vehicle updated, I was able to run diagnostics through INPA and the HPFP appears to be the issue. Fuel pressure at crank takes too long to build and at idle it fluctuates enough to potentially be the cause of my misfires. When the car is at higher RPMs the pump is able to keep up, which is why I don't feel the misfires anywhere but idle. This more than likely points to seal degradation inside of the HPFP. I've ordered a new HPFP, misc gaskets and a new HP sensor from ECS as part of a kit they offer. I should have the parts installed in the next 1-2 weeks and will report back then.
But the shadow code for the LP fuel sensor short (when the car doesn't have a LP fuel sensor) is still a mystery. I have verified with my own eyes that the car does not have a LPFS, at least were it's supposed to be.
TO BE CONTINUED...
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