Help me diagnose last couple bugs on the swap.

dartslantsix said
I tested all the injectors and cleaned them out, so I believe they are good.

I'm assuming there is some sort of check valve on the supply side? Google is saying there may be one in the pump?
The regulator would also have to seal, correct?
How do I test which of these items is bad?

Edit:
Just read the FSM, which has a great explanation of the system. There is a ball check valve on the outlet of the pump. The pressure regulator is supposed to seal the return side.

Tomorrow I'm going to pinch the hose to see which side is leaking. My hunch is that it is the pump. Will update later.

Okay, so I just got back from a long drive and the car seems very happy now.

I kind of shotgunned it, but not without merit. I replaced the pump, regulator and the coil.
Before doing all this, I clamped the return side and noted that the pressure dropped slower than when it was unclamped. I could not clamp the supply side because it is braided PTFE hose. So, I figured both regulator and pump were leaking.
I replaced the coil because it was out of spec and not very expensive. Anyway, car is running much smoother now and starts much better.
Thanks for everyone's help!