Ford Focus 1.8 cuts out when slowing down.?

After a short while of driving, red lights come on , speedo drops to zero and the engine stops... will start back up after a short stop. can be very scary when traffic is behind .... Advice please. Have had a diagnostic test, Ford could find no Fault..Had the idling valve cleaned out...still same problem....This is doing my Head, somebody please help.. thanks Dave..... ..
 
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