auto choke stuck on

ive got a 1987 mark 1 gti cabby, its like the auto choke sticks on. do u no if a new auto choke would cure it? or will it be somethink else.. it always revs between 120 and 150 and doesnt drop and causes the car to over heat. any ideas?

tom

have a read of the pierburg 2e2 FAQ in the big block carb section