@Ozzy26083

I know you joined a while ago.

Please take a minute to fill out your car model in your signature, Year,Spec,Fuel type,Engine size.Manual,Automatic,AWD,FWD..it helps us when answering your questions and saves you having to type it in all the time. Details can be found here...............Welcome to the Forum, Please Read

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Could be that the glow plugs are on their way out or one or more has failed. That would possibly explain the rough cold running which clears when the engine has reached operating temperature.