Hi, I have zafira 1.6 2008 100,000 miles on the clock idle is a bit intermittent ,it has fault code p0171 as well I resently had cam belt fitted , and I cleaned out egr channel ( removed in let manefold) p0171 is lean bank 1 when I removed inlet manifold I had half a cup of oil in it I don't know what this means but I doesn't like to idle any help please.thank you
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