Shake at low revs ... mechanic said it’s normal?

[MoZetecS]

I’m new here, not too sure how this works, but I have a 1.0 ecoboost focus 2012. When idling my car is noice ... when driving it’s even nicer ... went to get my car serviced today (61,000 miles) and thought ide show my mechanic something I thought was an issue ... but he is determined is fine and normal ... 

 

so so when I’m idling ... ide accelerate, but when I release the accelerator and the revs drop to about 850-1250 rpm, the car shakes a lot for alike a 2 second then it’s fine. But the shake isn’t just unnoticeable, it’s a pretty “whiplashing shake” ... is that normal? Lol I don’t think so ... just want to know if anyone else experienced this ... and if they have what could it be!! 

[Lynx8484]

Hi sorry but i have a very similar problem on my 1.6 ecoboost automatic zetec s. When I press the start button it strikes up then loses revs as though it wants to stall for 5-10 seconds but then it's fine until i press the button to stop then it just isles for 10 seconds before it comes to a small shuddering stop, unless I open the drivers door then it shuts of straight away. Only had it serviced Friday and the garage said it was bringing no faults up at all.