I have a 03 plate TD5 MANUAL when you first start it dosnt matter if it's cold or warm (worse cold) but fires up runs like it's going to die revs pick up but if you press the throttle it will rev lazy and all of a sudden pick up and rev freely, I have just fitted a regal sport exhaust And new turbo cartridge I started it with the down pipe off and could here the misfire really bad then picked up and ran ok but slight misfire under throttle but it has had new harness and injector seals how common are they for the injectors to fail them selfs ??