We just did another "test" where we put a latex glove around the oil filler hole with a rubber band around it and then started up the engine, and the glove blew up fast like a balloon - almost popped. If I remember from all my searches, this means a bad PCV, but my car does not have a sepa...

My 2007 S40 runs horrible in the morning when first started up. It idles very rough, sounds horrible and has a shaking/vibration when in drive, and foot on brake (at stops), lack of power and is getting lousy gas mileage. No code has been thrown. We have replaced the ignition coils, spark plugs, air...