Oh god, I dunno. hehe After getting sick of throwing parts at it, I just dropped it off at the stealership. $1100 worth of parts and labor (mostly from diagnostics, they spent close to three weeks trying to get it to pass) now it runs fine. The only real part replaced was the "mixture control" which is the throttle body. The rest was a mix of vacuum lines and hoses. I'm sure the adjusted the mixture as well with a meter hooked up.

In the end I'm pretty happy with the result. They changed all the little things that were damaged or missing, such as those air cleaner insulators and the idle control valve bushing, as well as a new drain plug. They even recharged the A/C (it was already converted to 134a, but has a small leak).