Re: ZR1 prom code chart
That AUAH8555 sounds like the stock chip for a 90.
There was a TSB 476503 that updated that chip
to 16163905. The new chip corrected a problem where
the idle would not return to normal fast enough after
coming to a stop.
This was found on some old email from 1999 so
it could be dated now.
__________________
Scott 
Vett owner since 1979. _It's about the car and the people
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