I've got a vectra 2.2 direct petrol running lumpy/rough on idle but ok
when normal driving. Have done the basics plugs,coil pack etc ,suspect fuel pressure
pump,any ideas??
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if it has a fuel pressure issue it should put the eml light on, i have changed a few of these (pumps) plus pressure reg/sensor but always has the light on, possible air leak making it run lean, it would still run lean at higher revs but less noticable !
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