Hi all, I have been having juddering issues with my Audi a4 avant 170 above 3000rpm mainly. First of all I thought it could be the MAF so went to GSF and pick one up and swapped it out... No better.... I the read online about the faulty piezo injectors on the Audi 170 TDI engines, so dropped it into Audi this morning and they confirmed my car was due a recall to check the injectors! Anyway they have swapped out 2 x injectors completely FOC. result!! However lack of power and juddering over 3000rpm very much still there. Audi have advised however that the intake manifold flap is stuck and needs replacing at a cost of Â£540 and that will improve power and stop the acceleration judder! Ouch!! Nowto the questions! 1. If the IMF needs replacing then surely the EGR valve will need replacing too? Or does the new IMF come complete with EGR valve? 2. Would a good clean of the IMF rectify the fault and restore power and stop the juddering? 3. How easy is it to remove the IMF and give it a good clean? 4. Does anyone have any step by step instructions illustrating how to do this? (preferably with pics)?? Any advise much appreciated, if the job is as easy as changing the MAF then I should be just fine!!:icon_thumright: All the best.