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This idle condition you are experiencing is caused by either an air or a vacuum leak or a leaky fuel pressure regulator. Have you checked the regulator for leaks? How about fuel pressure?
Another possible cause would be a cracked or ripped air intake snorkle from the mass air flow sensor to the throttle body. This could cause a major air leak which would result in a severe lean condition.
Look close around the intake manifold and throttle body gaskets as well as checking the vacuum hoses and lines for leaks and fix or replace any as needed.
Here is a picture of the fuel pressure regulator. (right hand side of picture)
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