Hey all, on a '97 A4 1.9Tdi: On two or three occasions I have noticed the following (really since the weather was hot): 1) Following a motorway run, come off the motorway then accelerate away from the exit roundabout, car very underpowered. Feels like there is no boost. 2) If I pull over, switch off igntion and restart immediately, normal performance is restored. Any ideas? I don't have VAG-COM. All electricals and hoses are in good order. Many thanks, Ben.