It does technically start and drive but the fuel pressure isnt there and you’ll go into limp mode, unless you dont in which case you’ll be fine. The car was making about 75psi of rail pressure when it should be 750psi at least and closer to 1500psi when driving. Intermittently it would make all 1500 but only if you didnt let it idle too long and it would cut back to 75psi under mid acceleration. Easy fix, sounds like a failing high pressure fuel pump, they go regularly on these cars anyways.
Remove the intake, 3 screws, and disconnect the fuel lines and your good to go.
Exact same issue with the new pump but now it will make higher pressures when it does decide to work. So one would figure maybe it’s the in tank pump and it dosent supply a steady enough stream of fuel so the computer throws a limp mode. That would explain the fuel pressure dips under acceleration.
Installed a new (used) fuel pump and filter. Same exact issues, just now the rail pressure sits around 90-100psi. Went fiddling around after that disappointment and realized disconnecting the hpfp solenoid made absolutely no difference to fuel pressure, so it would seem that the problem has been electrical all along.
Picking up wiring diagrams tomorrow and with some luck I'll find a problem.