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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
17,010 Posts
I agree with not tampering with the distributor adjustment. If the timing sync was zeroed with a scan tool, it is now correct and is not the problem.
If the problem started after the tune-up, revisit the tune-up parts and procedures.
Non-OEM parts can be a headache. I always use AC-Delco/Delphi parts on GM vehicles as I would always use Motorcraft parts on Fords. You don't need to buy them at a dealer as many parts stores carry them.
Double-check the vacuum hose routing as pictured on your underhood emissions label.
Sometimes if the ECM can set a fault code for the problem, it will but it might take some time (like a couple of drive cycles until the fault code matures).
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