Check engine light still flashing after changing plugs and wires

Hello, what testing has been performed? Yes, plugs and wires are a good first guess, but misfiring can occur from other causes too. First - are the parts used genuine GM parts? I would make sure everything is high end before going forward. Second - were they installed properly? All wires and plugs installed and gapped properly? Third - has compression testing been performed to see if you have a base engine issue? Has a test been performed to retrieve diagnostic trouble codes giving clues what cylinder for cylinders are causing misfires? Once you know the cylinders involved, you can swap components and see if the concern follows the cylinder alone or the components on a re-test. Truth is, hands on testing by a skilled technician is the best idea always. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.