Strange cold start on 84 4000 quattro

[Johnny B]

Ran in to a very strange cold start issue this morning on my newly acquired 84 4kq. The previous owner had warned me about it, but the symptoms he described didnt make sense to me. And, after this morning, it really doesnt make sense! 

The car turns over but doesnt fire. After letting it sit for a few 
seconds, it turns over and coughs, but misses. More turning over and 
then finally it fires and coughs to life. Very choppy but after a few 
blips on the throttle it smooths out to a nice idle just above 1k rpm. I notice here when I blipped the 
throttle a few times it sounded like the motor was bogging, and the intake was quite
 loud. 



I bring the RPM's up to 2k and its smooth, but at 2200 RPM it bogs 
itself down and brings the RPM back to 2k. If I hold lightly on the 
throttle bringing the RPM up it will cycle this (up to 2200, bog, back 
down to 2k, up to 2200, bog, down to 2k etc etc). If you floor it, it 
just bogs harder. After letting it idle (which during all of this it's 
idling very smooth) 30-45 seconds, all symptoms go away. Runs smooth, rev's
 up as it should, all problems go away. There was no smoke at start up..
 I'm definitely stumped.....

Insight appreciated!

Johnny