The problem is, Mikki, that you seem pretty sharp on the mechanical end with a degree of knowledge and hands on experience that exceeds most people on this forum - so, if you dont know what the explanation is, then most others may not be able offer much.
For what it's worth, my only offering is that it appears to happen under load (uphill, light throttle in 3rd) and can be cleared by gear/throttle change and is therefore more likely to be fuel mixture issue rather than mechanical.... maybe?
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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