I have removed the airmeter(plentum) assembly and throttle body assemblies from the car,found fuel puddling inside of intake. Obviously an internal leak. I have three questions

1.) If the fuel injectors are leaking down will the fuel puddle in the manifold?

2.) I think the other 2 possibilities would be the cold start injector or the fuel distributor. How do I test with the parts for leaking if I have them removed from the car?
3.) Which of the three or two components would someone with experience start testing first? The injector are the steel units.

Thanks for your support

Blownbenz