2012 Focus ST-2- Revs dropping and stalling.

[stuvine]

Has any one else had this issue?
On random occasions usually when changing down a gear(EG 2nd to 1st), the revs drop very low to below 500 rpm, and on occasion it causes the car to stall. This happened a few times when we first got the car but my wife and I just put it down to us driving diesels for the last few years but it's happening more lately and starting to be a concern.
There doesn't seem to be a specific set of circumstances causing this and i've spoken to my dealer who says they have not seen the problem, but it seems to be cropping up a bit on some US websites.
Any advice?

[AdamC1983]

Simply get it back to the dealer you have warranty still surely?

[dele]

Split boost hose?

[JohnWest]

Split crankcase breather hose? The one on my mk1 split and collapsed and caused exactly the symptoms that you have described.

Sub £10 part, 30 minutes of getting my hands dirty, et voila. Smooth idle and no more stalling.

[neiljohnson]

This is a known issue & ford have issued a tsb on how to rectify it

There is an electrical connecter that causes it

[stuvine]

Car coughed this morn and this time engine management light came on aswell.
Along with 'engine malfunction' warning on dash when I re-started.
It's with Ford now being investigated.

[neiljohnson]

Show your dealer this

http://www.fordservicecontent.com/pubs/content/~WT...

Should get it sorted quickly for you