severe miss; pulled codes

[jrichker]

One thing I did notice: I checked the timing just because (SPOUT out), and it looks like it was wandering anywhere from 8-12 deg BTDC (I originally had it set to 10 BTDC. Also, whenever the "miss" would occur, there was no flash from the timing light. I'm assuming that particular plug did not fire at that moment.

Now, would this be a cause or a consequence of the "miss"? I have new cap/rotor and wires, and "newish" plugs, which leaves the coil (not likely), the distributor itself (also not likely), and the TFI module. Anyone know what the symptoms of a faulty TFI module are?

The cylinder balance test will wander as you described if the IAC cannot raise the RPM sufficiently when it does the cylinder balance test. It needs the IAC to raise above 1450 RPM to get accurate test results.