Engine issue, can anyone help?

[StarBenn]

The injector being worse after its left standing would be because rail pressure will drop when the car is left off and when you try to start it the high pressure seal in the injector will let fuel go into the leak off system instead of letting the fuel rail pressurize properly, meaning the engine has to turn over a few times to build up enough rail pressure for the injectors to fire.

Would there be any other signs that one or more might be gone?