Sounds like the same issue I've had for a while. It seems to be getting worse though. Like you said, the car drives fine for a few miles and then begins to vibrate upon acceleration. Really noticeable after coasting such as accelerating after coasting through a turn. It also gets bad when I sit in a lot of stop and go traffic. Lately, on long drives, it will start vibrating and eventually throw a check engine light for a misfire. The funny thing about that is, I can turn the car off or drive at a steady speed for a few miles and the check engine light will go off.
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