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started about a week ago (after finally getting the electrics sorted after 3 months)i noticed the car whilst driving along would lack power ,it sometimes cleared if i put my foot down or if i dropped down a gear,over the week though it got worse and was doing it all the time(missfiring/spluttering),even when car is not moving,put it down to spark plugs,had 4 new ones fitted still same problem,(basically only running on 3 cylinders),,unscrewed each plug individually and started car and realised there was no spark from number 4 cylinder,on my car there is an individual coil pack for each cylinder/spark plug,bought a new one for cylinder number 4,,fitted that and now have spark from all plugs,but the problem is still there,not quite as bad,more so when moving slowly or reversing,,any clues im new to the forum,any ideas would be appreciated,mark