You know what the worst part about an intermittant problem is? The fact that I don't know what the heck I did to fix it. I took out the main vac line, and shook it like a british nanny, hoping to see some shrapnel fall out of it. After doing this for a minute or two, I stuck it back onto the car, and did a few more vacuum tests (I wanted to see if the splitter was prioritizing the booster over the "small" splits. It seemed to do this.). Drove around and it worked just fine.

Why oh why couldn't it be an obvious issue? >

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(Oo{=|=}oO) 1983 MB 300D USA, 212,000mi. 80's yellow/white. "Gunther"
(Oo{=|=}oO) 1984 MB 300D Euro, Turbo Added in Germany, 186,000mi [SOLD] Missing her dearly.
(Oo{=|=}oO) 1984 MB 300D USA Turbodiesel, 269,000mi. [SOLD]