HELP! Almost stalling NX2K

[Stefan Bauroth]

I need some advice here guys. My girlfriends '93 NX2K is giving her trouble
when she starts it. When the car is started it takes a few cranks to turn
over. When it finally does turn over the rpm's jump up and then suddenly
drop down to the point where the car almost stalls, then the rpms go back up
to about 1,000 and the motor smoothes out and runs/drives just fine.  I'm
stumped. Any ideas as to what it could be?

TIA,
Stefan Bauroth
'92 SE-R