Engine Partial Stop Fireing on 1990 Chevrolet Celebrity

One or more pistons quit firing at no predictable time, temperature or speed. Engine will resume firing within two-three miles of driving, just need to baby it along. I've relpaced all six injectors, the fuel filter, the ECM, spark plugs, plug wires, intake plenum gaskets and all fuel related o-rings on the engine. The fuel pressure is within specs. Compression is good. I've cleaned the air horn and visually inspected all wires for obvious breaks. The 'check engine' is not illuminated. I've checked for a stored code but get the condition good read out. Any other ideas? Thanks. . . Pete

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