I have a customer with a '93 T/A that had several Optispark issues. I replaced it with a $350 Delphi unit, and it has been fine since.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4
2019 Canyon SLT Crew 4X4
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