In response to your suggestions, attached find the Binary, ADX, XDF and latest datalog files being used on 16197427 PCM on the 350 Vortec with 454 throttle body and supposed Cop Car injectors. Set the ignition timing to zero degrees on the balancer with a timing light with the one wire disconnected coming from the distributor to the PCM. Then reattached this wire. Used the timing light and saw the ignition timing retarded -10 degrees from zero degrees. Puzzling. Advance the throttle and the timing may go 10 degrees advanced yet the TunerPro screen says 20+ degrees advanced yet the strobed balancer says 10 degrees advanced. More puzzling. May have a defective spare 1 16197427 PCM?
Also replaced the IAC motor with a new one after the log reported IAC fail. Last run (attached) after several minutes IAC went FAIL again. More puzzling. Again, possibly defective spare 1 PCM?
Will remove 16197427 PCM from my 1994 454 suburban and use it for testing after replacing the flash chip. Then record another session.
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