Another thing. My (former) mechanic did the same thing you did.

He pulled all sorts of vacum hoses off and on and nothing changed, so he determined that there wasn't a vacum leak because nothing changed.

But, there was a vacum leak all along at the intake manifold seal. Which is why nothing happened when he pulled the vacum lines off.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".