I discuss the design flaw that exists in Weber IDF carbs that causes the idle circuit to get blocked easily, and I set about unblocking the idle circuit so that my 1974 Beetle will drive nicely once again.
I had the same repeated blocked idle jets.....cured the problem by fitting fine gauze covering the centre part of the carb where dirt gets in. 1 year later...never had blocked jets again!!
Try spraying carb cleaner into the areas with blockage. This has worked for me on my 1961 corvette Carter and my 1976 mercury 850 outboard. All had blocked idle circuits. After spraying with carb cleaner the blockage was dissolved. Immediately for the mercury and overnight for the Carter. Idle is now amazingly smooth.