SLK 320 Engine Dies at speed, sometimes restarts before stop

[brittt1]

I have a SLK320 2004 that have been having problems. The issues i have are:

1) rough idle sometimes the engine just dies, restarts straight away
2) Engine dies at speed, coasts to a stop turn ignition and nothing, wait a few mins turn ignition and the engine cranks and starts fine.
3) Engine dies at speed, take foot off gas for a few seconds and it fires back up and continues down the road accelerating again.

sometimes this happens consecutive days sometimes it doesnt happen for weeks.

Oh and no check engine light or anything else.

Im out of Full warranty and dont relish the thought of it sitting in a dealer for weeks at charge.

If anyone has had the same problems with resolution i'd be very interested to hear how they were fixed. At least this may give the dealer some idea of what the problem is. Thanks.