ECM/PROM problem, need help

[jhart625]

I swapped out my ECM in my 1985 Chevy K10 350 5.7L truck yesterday. I went to auto zone last week and gave them my core and they ordered the correct ECM for my truck. When i got my ECM it said i needed to take out the PROM from my old ECM (which was sent in and i no longer have access to). Wish they would have told me that beforehand but i guess i should have researched into it more and known better.

Anyways, my new ECM does not have a PROM. So my check engine light is constantly on saying code 51. The truck is running fine but i won't be able to pass smog unless i can get rid of that check engine light. I called up the Chevy parts dealer and he told me that i am basically screwed because they no longer make it. He told me my best bet was to go down to a scrapyard and try to buy the computer and hopefully it would work with my truck. He said the most popular PROM that year was "3988 CRD".

Ive heard about people programming these PROMs from a blank one. Is there a website that i could find that they could program one for me? Can anyone help me out or give me ideas as to what i can do and what my options are? Thanks everyone.