Running rough and idle die out are not usually associated with a RCM, more like a CPS on it's way out.
Where in Georgia are you located ?
You might want to try Buckhead Imports if you are in the Atlanta area.
( at any rate, a NEW RCM module runs around $230, NOT $700 - I think I smell a stealership rip-off in progress )

It could be as simple as a vacuum leak. ( that would cause rough running and quitting at idle. )

Where did you purchase it from ? Did it come with a warranty, like 90 day etc .... ?