Hi, I'm looking for help regarding my 2005 9-5 Arc 2.3T with 100000 miles. The engine pulsates noticed when I'm backing up after a cold start, when I'm on the highway coasting down a hill or sometimes climbing a hill at ~40 to 50 MPH. I've changed the plugs and the Direct Ignition cassette. I can't find a vacuum leak so far. Any thoughts?
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