1999 0411 swapped 454 #4 misfire

It can only sometimes be felt, unknown if it actually is misfiring. The motor was professionally rebuilt, new distributor, plugs, wires, injectors, fuel pressure regulator. Randomly while cruising the misfire count will rocket and take the torque convertor out of lock. I wonder if its a glitch in the computer? It runs great under any sort of load. I dunno??? I know I can take off the misfire count... But I have had this problem since the 411 swap.

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