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The vehicle that provided the engine was a 2004 Sierra 4x4 with ls 5.3 LM7. The vehicle that provided the PCM with the IAC driver is a 2003 Avalanche 4x4 also with the ls 5.3 LM7.
And thanks for your suggestion of just swapping in the complete 12587603 OS. I'd already figured that was going to have to happen. But no, I don't have any HP Tuners hardware or software. Was hoping to avoid all that. Really prefer the DIY approach using community-based tools!
I totally agree. I do have HP Tuners. If you want to upload the bins you have, I can flash them into a spare PCM and read them out and upload them in HPT format. That way you can look through them and compare.
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By the way, my follow up question was going to be, once I swap in the 12587603 OS, would I need to segment-swap in the engine calibration from the original donor PCM, or is the new OS likely to run the LM7 just fine? I will also use the 4l60E. Would I need to segment swap something in for the transmission as well? Complete newbie here, so...
Either should run the LM7 just fine. If the Avalanche had a 4L60E, you should be able to run that calibration. If not, you should be able to segment swap the transmission segments. The post you referenced indicated that most segments, including the trans segments align.