Ok, sounds like getting the idle speed up is the first thing to be done.
I think the spec idle is 700-750rpm. I personally run my car at 850rpm (same engine, non turbo, no electric idle control).......I like the A/C working well at idle
I'm pretty sure that you have the electric idle control on your IP. There is a 2 pin electrical connector on the back of the IP. with the engine running disconnect it. The idle should drop. If it does then the idle control is working, if not then there will be some electrical diagnosis that I'll run you through in detail next week when I have the specs in front of me.
The base setting for the idle (with idle control disconnected) is about 600rpm, the idle control may be your fault.
Try that and get back to me