1. A vehicle comprising: an internal combustion engine having a plurality of cylinders; a motor coupled to said internal combustion engine via a gear mechanism; and a control device carrying out a determination process controlling said internal combustion engine such that said internal combustion engine is in an idle state and determining, based on rotational fluctuations of said internal combustion engine at the time of said internal combustion engine being in an idle state, whether or not an imbalance abnormality where an imbalance arises between respective combustion states of said plurality of cylinders is present and a particular control causing said motor to generate suppressing torque acting in a direction hindering said internal combustion engine from operating for suppressing vibrations of said gear mechanism while said internal combustion engine is operating, said control device comprising: a determination unit carrying out said determination process; and a control unit carrying out said particular control, said determination unit temporarily determining whether or not said imbalance abnormality is present based on an air-fuel ratio in exhaust of said internal combustion engine and, when it is temporarily determined that said imbalance abnormality is present, controlling said internal combustion engine such that said internal combustion engine is in an idle state and carrying out said determination process based on said rotational fluctuations at the time of said internal combustion engine being in an idle state, and when said internal combustion engine is in an idle state, said control unit carrying out said particular control when said determination process is not ongoing and not carrying out said particular control when said determination process is ongoing.