If you find a leaky injector, I would replace just that one.
However, don't rule out a defective new fuel pump and regulator. I replaced mine last year for the same problem but the problem remained. Very frustrating. After finding no evidence of leakage at the fuel injectors, I replaced the new fuel pump/pressure regulator again with a new one which fixed the problem. At least Rock Auto gave me partial credit for the defective first one they sent me. It was only a partial credit because it took me so long get around to troubleshooting it more to discover the first one I received was defective.