Sounds like there may be too much air coming into the engine unmetered. Is there a check engine light at all? I would look for a vacuum leak and check for codes.
I'm not sure if the fuel filter scenario is sheding light on the problem because of the symptom change,
If it is relevant, then I need to have the fuel pressure checked against spec.
Saturday, January 9th, 2010 AT 8:27 PM