Thank you for your response we figured it out. We pulled the one fuel injector back out cleaned it out more oil on the Injector and did the ice pick truck on the Injector. Put it back in and it worked..thank you for your reply and hope this info will help other diesel owners
I have an 2005 Duramax diesel 2500 hd lly I replace the 2nd fuel injector as it came up as bad got it replace I start it does fine at idle when you rev it up to high rpms it knocks bad any suggestions