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A timing light will not show spark, even if it is working.
If both leading plugs are not in place, neither will spark.
If your tach works, you have spark. (unless the trailing coil is bad)
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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