Thanks Don!
We buttoned up the Suburban and rolled it out of the shop this morning, then cleaned up and got organized.
Opening the PCM, we found that we actually have the chip to control a IAC motor (circled at top right). That means we have the option of sticking with drive-by-wire or installing a IAC and converting to drive-by-cable. Decisions, decisions.
Additionally, this being a L59, it's flex fuel capable. We snagged the alcohol sensor from the Suburban so that we can retain that capability. Dad will be able to run corn whenever he wants, without having to switch tune files.
