2008 dodge Avenger 3.5L 140,000 miles. Car runs great for however long I’ll run it for, until I shut it off for 5 to 15 minutes after it’s up to temp, then if I start it, it runs like shit, Has a misfire so bad the car shakes, and has no power until I shut it off again. If I’ll let the car cool down for 45 minutes to an hour. She runs great again. Put new plugs in it.