SaskVR6

Hey guys. I got this sweet vr6 with some starting issues. O3 golf gti 2.8L about half the time I start the car the revs bounce between. 1200rpms and 200rpms it will bounce about 2-4 times, sometimes stalling out. After 4 bounces the car seems to run just fine. It has became worse now and the car stalls out more often. There is no check engine light on. Has any one had this problem, what could the problem be. Where should I start to look. thanks