It could also be the resistor pack in the '86 and early '87 models years they used low impedance injectors, with a resistor bank feeding them. Make sure that you have power to one side of the fuel injectors when the key is on.
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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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