The engine was still idling, and he has not been heard from since.

I could hear the engine idling against the still night air.

The engine was idling because Johnson had a lot to say.

Two other men sat in the front seat with the engine idling.

Both of them got out while the driver kept the engine idling.

A truck stopped on the other side of the building, its engine idling.

Four of them went to do it, while another two waited in the second car, the engine idling.

Instead, he pulled over on the opposite side of the road and sat there with the engine idling.

The engine idled so quietly it was hard to tell.

They heard the engine idling, the car having stopped behind the ramp.