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Have you tried the usual?
Check compression
Check fuel pressure, stopped and running
Verify ignition on all four plugs (using inductive timing light)
Check timing
Run dedicated ground wire to the ECU grounds on the engine
If you could describe what the engine does under throttle blips, WOT, Idle, deceleration in and out of gear, etc. it my give us a better idea of the problem.
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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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