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Welcome to the forum !!
Best that you dont touch the modulator until you establish that you have good vac there first!!
Would be useful if you could put a pic up of what you are refering to near your air cleaner.
When you get a chance, could you put some details about your car in your signature so that we no a bit about it.
Good luck !
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Grumpy Old Diesel Owners Club group
I no longer question authority, I annoy authority. More effect, less effort....
1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles 
1987 250td 160k miles English import 
2001 jeep turbo diesel 130k miles 
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving
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