Cadillac ct5 tachometer is unstable.

The instability of Cadillac ct5 tachometer is caused by excessive carbon deposition. There are many carbon deposits in the valve train of the engine, such as throttle valve and mixed gas combustion chamber, which will affect the intake of the engine and the combustion of mixed gas, lead to premature combustion and deflagration, and also cause the engine speed instability. In this case, it is recommended to go to a professional auto repair shop for inspection and maintenance.