what should the fuel pressure be at idle at schroeder valve? 93 Z28 with stock injectors.

 

On my 97 at idle the manual says it should be at 37-38 psi. Before starting it with the key in on position and pump on it should be between 41-47 psi. It may be different for a 93, not sure though. I would pick up a Haynes or similar manual for your car.

 

93 has different injectors than 97 right? does this make a difference?

 

I beleive the 93's use 22lb/hr injectors, I know the 94-97 uses 24's. I would think the fuel pressure may be different while running but not sure, probably the same with just the key on. Your model year was unique for a lot of things though, best to get the manual for it, and they are only like $15-20.