I concur with “new doesn’t always mean good.” If it was anything other than a Petris Enterprises, an Optidpc rebuild, or a personally refurbished original GM then it’s almost certainly garbage. I can’t even begin to tell you the number of times people showed up to the Corvette forums complaining of these sorts of symptoms but denying the opti only to find out their new parts store special or Summit or MSD was total trash.