First thing I would do is to get a piece of tube & connect it to the diaphragm at the back of the IP, then with the motor running, suck on it, it should shut the motor down, if not its the diaphragm. If it does shut it down, then it gets interesting, you should check to make sure you have vac at the vac pump. then work your way through the system. do your light adjusters working? They run on vac. Do the brakes work ok? A very heavy peddle would suggest the vac pump is bad.
I didnt say to hit anything with the hammer!!! As its moving & shouldnt, maybe it needs duct tape. 
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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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