Hey, new here. My basic reason being here is i've been searching for just a stock prom for my 1990 454ss but GM doesnt even have a number. So I've been searching for numbers all over the place, searching my ECM number in hopes to find a list of PROM numbers, but no luck yet. I stumbled upon this site, and this seems like the place to get some answers, might even get into tunning my own chip. Please check out my post in the GM EFI section, I've got a detailed description of whats going on. Cheers!
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