No powe, but starts & idles fine - C70 D5 - 2007

[JagPJ]

My C70 auto has been having issues. It started with jerking/hesitating at low revs (1200/2000) when I wanted power, but I drove around that using manual to keep the revs high.

Then last weekend it just wouldn't rev at all, even in neutral. It starts and idles fines. Just won't rev past 1500.

It's got no faults, and has had a fuel filter change. EGR has been checked as well...

Oh and it seems the colder the outside temperature, the worse it is!

Any ideas?

[renorti]

check boost/vacumm valves, these can fail.

[morgrp]

Nothing blocking the intake?