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i would be guessing you're reffering to the Air Flow Meter (AFM)...
my dad is in the process of replacing his currently, after an LPG mixture incident in the manifold, he reported some very similar circumstances with the depression of the plate.
if all else fails, replace it with a second hand unit.
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W114 1969 250CE - M110
W114 1972 280S - M110
W116 1979 450SEL - M117
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