I hope it does turn out to be the vac hoses. Should be able to get a look at those tomorrow. Driving to Cirencester to help a friend put his engine back in his Saxo, while there we are going to have a look my vac pipes.
I feel a bit silly, earlier in the thread I said I cleaned the MAF but haven't checked the TPS yet....that's not quite right. My Focus is a pre-facelift one and the engine doesn't have a MAF on the air box. What I cleaned was the TPS at the bottom of the intake pipe on the throttlebody. I confused myself because I had originally been told that that was the MAF but it isn't.
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David
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