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Something mechanical, ignition, or fuel.
It can run rough under a load such as in gear and ok in neutral with no load. Have you checked the plugs and dist cap ?
It sounds like you have an engine misfire. Your car probably idles rough through each state, including Drive, Park, and Neutral, but you'll only really notice it when you're transmission is engaged. Anyway, there are only 2 things that can cause a misfire: ignition issues, or fuel delivery issues. The most common of all issues is a loose or damaged spark plug. A lesser issue for ignition systems is a bad coil (this would depend on the year of the car). An even rarer issue would be a bad fuel injector (again, this depends on the car's age). I would begin with this diagnosis. You can find videos on how to check the spark, which is where I would start.
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