Are you sure you throttle body is not damaged? it is not unheard of that people have damaged the throttle body so that it become slightly misshapen more so down to position than anything else?
Additionally as said what rating is on the alternator? (it was known for some time the earlier cars failed because the alternator was a lower rated one than the later cars (if you get a bigger more powerful variant then you need a software update). Battery is another potential issue.
Glow plugs on the 2.0D are not used until -10.
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