How can I regulate my 1.8 cardureted jetta

I have a 1992 Jetta 1.8 carbureted. When I start it from a cold start I have to rev it for about 30 sec before I  can let go of the gas and the car would stutter for a couple of minutes and then it levels out. Car runs fine after that It starts right away after that and at times when i come to a stop it starts stuttering and when i rev it levels out. I was thinking of putting another carburetor in. But wondering if the Bocar has fix.