Balleknack

Mondeo 2.2 TDCI 2010 jerks/missing when it's warm outside

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First of all I'm Swedish so I apologize for my English in advance :).

I have a weird problem on my Mondeo diesel. When it's above 7-8° outside the car runs jerky between 1400-1800 when driving at a constant speed. Just a small tap on the throttle will make it go away but mostly you're around those RPM on the highway or in the city. In the summer it's a real pain but now when it's starting to get colder outside the car runs perfect. No fault codes appear which make troubleshooting even more difficult. I've heard people say it's the EGR-valve but that would most likely generate a code and the problem wouldn't just occur when it's warm outside?

Got any ideas?

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