I had a lot of similar trouble some years ago. The TB was replaced and all seemed well - until it rained heavily again (I was in Scotland at the time, so didn’t have to wait long!  ) and the strange symptoms restarted. In the end, the garage took that plastic box apart and discovered signs of serious water ingress. IIRC, the seal was available as a new part, but it may have come complete with the lid.
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .
Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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