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vectra b fuel?

vectra z1.8xe engine misfires on idle/wont take throttle
sometimes it will suddenly rev up but still seems to have slight misfire engine revs drop&will either stall or
idle very rough back fire&knocks as in pre ignition
have replaced camshaft crankshaft sensors also throttle body
have changed fuel pump ignition pack air flow meter with another car(which run witrh my parts>
jimsmazda, May 2009
have you checked the lamda sensor rough idling is normally caused by these

bob k, May 2009
link Click here to see other fixes for Opel Vectra B.