If it is the optispark you are not going to recover from it easily. 123k on a non-vented optispark is a lot. An optispark set up has a lot of parts. More than likely the cap and rotor have never been replaced. Even that requires the removal of the water pump. Good luck, its a pain in the behind.
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2017 Camaro 1SS 1LE Hyper Blue
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