I found this awesome link with a big chart of ECM's and PROM's. I didn't know they had separate ones for different size wheels and California/49 state cars.

http://www.exatorq.com/ludis_obd1/fieroprom.html

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Jonathan
1987 Notchie - undergoing surgery
I'm not a mechanic but I play one in my garage - me
Power tends to corrupt, and absolute power corrupts absolutely. - Lord Acton
Those who hammer their guns into plows will plow for those who do not. - Thomas Jefferson

See https://www.fiero.nl/forum/Forum2/HTML/103060.html

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave (It's also at the top of every forum page...)