James,
The Z will not rev past 4500-5000 without being on a load from neutral.
You get around that safeguard by revving it in 1st gear if equipped with a manual transmission.
Can't answer anything else, but the normal procedure was like you just did to reset the ecu by disconnecting the battery.
I hope someone else who may have had this issue or code can chime in to help.
Good Luck & Happy New Year!!
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