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X2 on vacuum. Any time I have had hard shifting issues on my 91 (or the 92 I used to own) it has been a vacuum leak.
The vacuum system is going to be very tired after so many years and miles. One of the advantages of doing the wastegate swap (do a search) is that you are able to eliminate much of the vacuum routing....fewer vacuum lines means fewer opportunities for leaks.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete
19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife
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