I have a 2005 mandate 5 2.0ltr petrol, it is misfiring on number 3 from tick over until 4000rpm, after 4000 rpm it revs normally, I have changed the spark plugs, coil packs and fitted a new injector on number 3 but still have the problem
Anyone else had similar problems

 

Have you scanned for fault codes?
Do you have a scan tool than can read the recorded miss fire counts?
Are you certain the miss fire is still coming from cylinder 3?