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Few more updates on this. Retested the front 3 injectors to be sure (back two are hidden under the plenum). They all check out at 12.7-12.8 ohms. All three injector harnesses test for continuity and show they’re firing using the injector tester. Good to known if the fuel pump circuit doesn’t send 12volts back to the ECM the ECM shuts down the injector circuit. The pump, pump circuit, and oil switch circuit all test good. I started to suspect the pump check valve might be the issue but the pressure doesn’t bleed down fast like everything I found with that issue on the interwebs. On a hunch I hooked back up the injector cleaner kit I have and found the system will not hold pressure through the return line. If I pinch off the return line the pressure builds up to 60 psi. If I set the injector cleaner regulator at 46 psi it leaks past the FPR. The FPR should the flow but it doesn’t. The return line comes out of the FPR so that must be the issue. I had the tank cap off and it was a direct run through like bad Chinese food. Definitely a bad FPR. parts are in now and I found an intake to plenum o ring at my local lordco so have everything i need. So glad my car is so clean the videos I watch make me want to barf thinking about working on them. glad I have the GM service manuals for this, they’re very thorough. Except the error of the cylinder order I found in the 3.4 diagrams. Shows the banks reversed. Dumbasses… page 6D4-7 wrong!

Ordered the FPR, seals, and injector seals. Already have the Plenum gaskets. will keep tinkering around with other things while I wait. Glad it’s not my daily driver