vauxhall zafira?

i own a 2001 vauxhall zafira 20 dti 16 v it wont start on a morning when cold or hot when travelling at low revs engine mangement light comes on and have no power ,give it a good rev over 3000 revs it goes out can you help?
stu worton, November 2006


done
wont start when cold

wayne, March 2007
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