I have a 2008 Honda Fit with 95,000 miles, automatic transmission. When I drive on the highway at approximately 2500 rpms (60 mph) the engine seems to slightly misfire. It does not totally lose power but there is a slight "miss". This does not happen at other rpms only at 2500 rpms. 2500 rpms seems like the place where the auto transmission would shift to another gear. I'm not sure if this is an engine misfire, transmission problem or other. Any help is appreciated. Thanks.

 

Spark plugs.

 

Read the coil/plug/valve Topic "Constant Speed Stutter"