Lexus CT200h: motor vibrations

Hi there, I post this thread about a problem of motor shake in my CT200H. I'm from France
My car is from 2011, the motor is similar than the Prius 3 and has about 75 000miles.
Candle have been changed 3 years ago, oil change has been made on the box last year.
I notice some vibrations when the thermic motor starts and especially at about 1200RPM.
I have read a lot of threads here and I'm thinking that a good way to start might be about the cleaning of Manifold Air intake, the trottle body and the PCV valve changing.
(EGR and EGR cooler seems to be a little hard to clean so I want to wait for this part)
Do you think that my initiative is a good one?
Thank you in advance