When I buy a PROM for my 1227747 is it one or two chips? The reason I ask is because my ECU has two empty sockets. the problem is that I ordered a whole ECM from Autozon, I thought. the web page wording sounds like I was getting a complete ECM with PROM so I sent in the whole unit as core only to get one without a PROM now I am stuck.

I have a 1990 GMC sierra that originally had a V6 but was swapped out with a 5.7L TBI. It seems that the engine, tranny, and wiring harness was all swapped out together.

I have all the info that was on the sticker on the old unit:
SERV. NO. 1227747 ARJU
86ARJU K302190396
16136301 ARJU