Since my last service a month ago, my 2004 TD5 has not started properly when cold. It will fire but then feels and sounds like it is only running on 2 or 3 cylinders. After 5 or 10 seconds it picks up and runs normally. I have had the injector loom and glow plugs changed costing over £300 and neither has made a difference. Was running perfect before service! Any suggestions, or has anybody had similar problem?