Hi everybody,
I bought Tahoe hybrid 2008 (185000 km). Recently I noticed that the rpm goes high up to 4000 even when I am not pushing the gas pedal and in many cases the engines Doesn't go to auto stop mode even when the engine is not cold.
I did not notice this issue frequently but when when it happens the car already moves ahead as it seems it lacks power to move.

 

maybe a software check for error codes with a dealer visit? they can check if your 12V as well as 300V batteries are still okay.