[christianchevell]

I would say you need to talk to a good shop, you may not have had all the pieces you needed and the shop you had do the work may not have known whats needed, with a dod /afm delete you should have the ls3 valley cover and routing of the pcv system you could talk to someone like elite engineering......you need misfire tables you need to save the engine with the computer should you have problems you need help...….. Good Luck! places to talk to that are really competent near you...…………..And I do see a good cleaning of your engine with some seafoam or other coming in your future at least with changing of your PCV system most likely, talk to Elite... and as others said someone like jannetty, GPI etc... that do the work all the time...…… it could be from the valve seals to wrong PCV to missing this or that.....