Why does X5M 2011 stall with new crankcase ventilation hose installed?

What is your question?

Crankcase ventilation hose cracked. Replaced it with new one but X5M starts and stalls completely. Manages to keep on with A/C on but at very low rpms. Worked better with cracked pipe, seems to be sucking air increasing rpms at idle. When on the road pulls hard, doesen't seem to have lost power or not perceivable. What seems to be the problem?

What makes this problem better or worse?

Worse when engine hot.

How long has your 2011 BMW X5 had this problem?

Recently.