I was at the local junkyard he other day, and there was a GM ECM in the back of a pickup. Anyways, there were no numbers on the case (sticker was gone). I checked to see if it had a calpack (can't ever have too many of these!), but it only had a prom. The code: ALFN4652. Anybody have an idea of what this thing came out of? Thanks for any ideas. Jon Fedock