Pontiac G8 GT. Build

Just starting this build. So far I have add headers,cold air intake and done a dod delete kit other wards. Hanged the cam and lifter no AFM. had it tuned but had to remove it for the Diablo sport predator 2 platinum. Cause it said to return to stock so I did and now it says no custom tune and my car is running like !#!%. Trying to figure out how to get a custom tune on it.