Q: My engine is shaking sometimes when I don't press on the gas pedal. I just changed all the spark plugs so it is not that.

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My engine is shaking sometimes when I don't press on the gas pedal. I just changed all the spark plugs so it is not that. I also have a rear main seal leakage but I don't see how it is related since the oil level is good. I also changed the fuel filter very recently and it didn't do anything.

My car has 148000 miles.
My car has an automatic transmission.

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