Q: There is a humming in park or drive but only when I push the accelerator not at idle.

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The engine makes a humming when you push the accelerator or when its winding down. It also will do it at standstill or when driving.

My car has 85000 miles.
My car has a manual transmission.

Depending on the severity of the humming noise and where it may be coming from, this may be related your exhaust vibrating on a heat shield or something else underneath the car. This is somewhat common when a catalytic converter begins to fail. I would recommend having an expert from YourMechanic come to your location to diagnose and replace your catalytic converter.

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