[RarlyL8]

Back at the motor mess this evening.
The auxiliary air valve (a.k.a. throttle bypass valve) has been removed and the lines plugged.

Here is what's left of the CIS:

Fuel Head
Air Flow Sensor Plate
Warm Up Regulator

That's it.

I Adjusted the idle screw from all the way shut to 2 turns out.
Hit the key and BAM she starts and idles at ~1500 RPM. Good deal.
In about 3 minutes the WUR kicks off and the idle shuts down to ~1000 RPM. I'm getting excited at this point.
Then it starts.

Vroooooooom POP Vroooooooom POP Vrooooooom POP

What the hell is that????
The idle starts cycling from 400 - 1500 RPM. I'm thinking this is a mixture problem so I back off the fuel mixture screw about 1/4 a turn. Hit the key and idle is at 1000 RPM. Cool.
So I get in the car and rev the engine. As soon as the rev comes down...........Vroooooooom POP Vroooooooom POP...... again.

So what's going on? Have I removed too much stuff and effected the idle mixture? Will another session with the gas tester and allen wrench cure this? What the hell is the "POP" noise? It is very mechanical / metalic sounding.