So I had some time to mess with it this week, and so far it's still running like ass.
Threw an LT1 Maf on it with a translator (I was gonna do this anyway, figured now was the time) have it set to ON ON ON OFF with the two tuning dials at 0 currently
Replaced the little vacuum hoses at the vacuum block, confirmed no leak
Checked vacuum line for brakes, no leaks. Even capped it off to remove the power brakes from the equation entirely.
Fuel pressure at idle with vacuum line on is 35psi, 45psi with line off
It'll idle all day in park, and has no issues idling in drive with my foot on the brake, but as soon as I let off the brake and the cars starts to roll the idle dips low and it shudders and dies.
TPS is set at .42
IAC at warm idle is 8
I did try unplugging the O2 just to see what it would do, and oddly enough it doesn't throw a cel for it. The scanmaster still shows O2 voltage and cross counts despite it being unplugged which is strange.