Q: Vehicle sounds like diesel engine

asked by on November 21, 2017

For the past few months the vehicle sounds as if it was a diesel engine; not so much clicking, but just doesn't sound smooth. I have changed the oil a few times and have changed the spark plugs. The noise happens when it is sitting at the light on Drive, if I move it to N, the sound disappears.

My car has 145000 miles.
My car has an automatic transmission.

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