I can now answer yes to all three of the above, I'm pretty sure I'm turning into a hick . . . plus, have you seen my backyard? Matt and I took on some more diagnostic work to try and figure out where our issues are coming from and what would likely need to be fixed. Some more research uncovered some useful information:
Feedback carbs were the worst system known to man; they have all the drawbacks of both carbs and EFI with none of the advantages.
We have a piece of classic American automotive engineering. There are approximately 4.37 miles of extra wiring and vacuum hoses going in and out of the carburetor. We have an O2 sensor, EGR valve, a throttle position sensor, an idle air control valve, and a few other things that feed into a computer and then back out to the carburetor feedback solenoid to adjust the mixture. I hear it works when it all works (thank you captain obvious), but when something goes wrong it is a nightmare to try to troubleshoot.
The first guess we have is that the EGR valve isn't doing what it is supposed to which is . . . uh, yeah . . . and maybe the TPS or the feedback solenoid are malfunctioning. Who knows if the O2 sensor is working? That just about covers the system. Plan B is to eliminate the stalling issue and go in for testing to see what happens. With any luck we'll pass as is and have time to diagnose further and repair and/or eliminate the feedback system and go to a vintage 1978 system, back in the good ol' days, I tell you what!
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