Reviews of DELPHI fuel injector

Injectors are leaking too much fuel back to the tank, it's an extremely common issue on K9K engines usings Delphi and Siemens/Continental fuel injectors.

What I have done since is change to delphi 415cc injectors which now idle fine and exhibit much better throttle response and run a haltuner O2 sensor to fine tune the mixture since the injector change. I am fairly confident the mixture is OK, I have used this haltuner on my supercharged 8v with good results and my spark plugs, if anything, look like they are on the rich side, a bit carboned up but not overly.