XC90 2.5T AWD 2004 w/ 194K miles. Driving on the interstate today at about 75 mph. On a long uphill, the car kicked into a lower gear, running fine. I noticed the check engine light flashed on and off, then the car started running rough. Got off the interstate and limped home, about 40 miles at 40-50 mph. Check engine light remained on, car seemed to be misfiring or missing a cylinder. On short uphils, the light would flash, but mostly just remained on. I am concerned. Any thoughts about where I should start? Coils? Plugs? Mechanic?
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