Throttle body is on the way out.
When you put the ignition on pump your throttle pedal a few times and see if it happens again (engine off)
If it does get it booked in.
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2011 Focus 3-door Zetec 1.6 TDCi.
Previous <img src="/images/graemlins/stemo.gif" alt="" />s - 2006 Panther Black & 2007 Red. Gone and quite forgotten <img src="/images/graemlins/lol.gif" alt="" />