I would remove the mass air flow sensor, which is situated on the inlet pipe between the air filter box and inlet manifold, I would remove it from its housing then clean it with engine/brake cleaner, to clean any dust/dirt off and refit. If any better I would replace the mass air flow sensor. It is one of the most common faults and the symptoms you describe fits into a faulty mass air flow.
Hope that helps.
Monday, March 28th, 2011 AT 9:41 PM