Review Proton Wira 1.5 (A) Engine vibrations idle and on gears

The foreman is very experienced and diagnose, troubleshoot the problems systematic and professionally.
I thought it was the throttle body problems but after checking and diagnosed the engine, the foreman informed that the DB is giving the problem. To confirm and conclude the findings, he put a new DB (DB meant for other Car) to test. After starting up, no more vibrations with and without aircond. Cost of the service with new DB is reasonable.
Will continue sending my proton to this workshop for servicing.