Re: 94 Z28 ECM Issue
My thoughts, if the trans has been swapped and same problem continued and used the '94 PCM, then either the driver of the trans circuit in the PCM is broke or poor connection at trans for shift solenoids. VSS works good I suppose since you have not said anything about no speedo and cruise control works.
Manually the trans works fine?
Another PCM may not be a bad idea. Just make sure the wires going to the trans are and scrapping against ground. Might measure solenoid coil resistance to make sure it there. On 4L60E trans, there are about 14 different electrical configurations for different models. Have Haynes manual? They seem to help, better than nothing.
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