Okay, so I am entertained by small victories! The intake manafold vacuum fitting (small) going to the flame trap was hopelessly clogged (so what's new) on my '86 240GL. After struggling with trying to clear the blockage and wanting to get to bed in this century, I found that a 3/32 drill bit, turned slowly, would clean out the nipple perfectly. (of course I removed the fitting from the intake manafold first!). Anyway, it really speeds up the cleaning process and I now pass the jiggle test again. Hope this helps someone.