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If the 1997 EGR must see flow (my 1996 does not) you can re-plumb the input to the air filter box or you can install a small filter (lawn mower, motorcycle, etc.) at the input. There will be airflow to keep the electronics happy but it will be clean air rather than exhaust.
Once that is done, remove and clean the intake manifold and associated plumbing of all accumulated carbon.
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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