Since the deceleration is really slow, it's almost like the throttle locks up at say 10%, when the change of the road means it needs 15% to keep the speed up.. From 100 down to 80-85kph could take like 10sec or something..
If I manually push the throttle then everything is fine and the speed increases, so I guess ESP/tc has no issues.
Is there any tb adaption that could be wrong like petrol engines have ?
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06 A8 3,0TDIq My daily driver and project...
97 A4 1,8Tq. Powered by a 4,2 from the '01 S6, full rollcage, FIA seats and 6-point harnesses, B5 RS4 KW Competition race suspension, B6 S4 brakes, 18" Toyo RS1 slicks, carbon fiber roof. V8 trackday racer 
14 VW Caddy 1,6TDI from my employer..
(X)00 A8 2,8q, (X)97 A4 1,8Tq, (X)92 S4 2,2Tq, (X)92 80 2,3E
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