Hi all, my new to me daily driver is a decently clean low mile (74k now) 2005 Focus wagon ZXW. I had to replace the battery Friday, which I knew was coming. It was old, and the cold finished it off. It ran great over the weekend, but today it loses power while driving, regardless of what I do with the gas pedal (partial or full throttle). It will then start kind of surging, kind of bucking as it picks up rpm and mph, then clears up and goes normal for a 2-3 tenths of a mile, then does it again. It will want to stall out at stops. When I parked tonight, it was doing the same at idle, sounds like it is running super rough, like on 2 cylinders, before cleaning up and idling smooth and I can take it up in rpm easily. Anyone ever run into this?