Need help: power programming eprom

[93 Formula]

I am having a problem getting my car's computer to "accept an eprom".
If I put the exact same program into an eprom that was in my original chip 
it works fine, but as soon as I change any data, the car's computer chokes 
on it and goes into "limp home mode" when the service engine light stays on 
and my diacom won't communicate. Is there some step I am missing?  Do you 
have to change some kind of check sum on the eprom for the computer to 
recognize a change or something?


Jeff
93 Formula
77 Nova
http://Go.To/LilDemon

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