Hi Keith, it could be either the egr or the idle control valves need a clean as they get gummed up with deposits you need to clean them with a spray "carb cleaner" do not use WD40 as the oil in it will cause the valves to gum up even quicker, contact me on nige110162@hotmail.co.uk and I'll mail you the info and locations
nigel
February 2009
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