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A manual transmission is about 400 RPM and and automatic is about 700. When you put the automatic in gear it will drop by about 200. When the engine is cold you can be about 1100.
The most common cause of this is that the engine mounts are hard from age and engine heat and no longer can absorb the normal vibration of any 4 cylinder engine. Also the idle may be slow due to a dirty idle speed control system or the engine can need a tune up or has dirty fuel injectors, I would service all these to correct the problems.
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