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The flap in the crossover pipe is supposed to open at 2550 +/- 100 RPM. Failure of this flap to open will reduce engine torque but should not make the engine stumble and also should set a code, as you have noted. The first owner of my '96 E300 had a situation in which one or another of the flaps stopped working. This set a code and the check engine light came on.
What happens if you drive at 2200-2400 RPM in 3rd or 4th gear (that is, is it the road speed or the engine speed at which the problem occurs)? Stumbling in a gasoline engine at a definite RPM could be caused by either an ignition or a fuel problem but in a diesel it would almost have to be a fuel (IP) problem. A flap problem would reduce the ram air effect of the intake 'tuning,' lowering engine torque but I don't think it would cause stumbling.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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