Engine shaking advice

Have a compression test done. Have the plugs checked, injectors checked and have it checked for vacuum leaks.

Roy

Tell them the symptoms, no more: "shakes quite hard for a minute or so after I
start it and then stops"

If you tell them to check a bunch of other stuff, it will add $ to your service / inspection.

You might want to let them keep the vehicle over night, so that they can
experience the issue the next moring. Since it is fine after a minute of starting the engine.

Thomas