Please post back what worked or not.

I am having a similar problem after disconnecting Vacuum Lines, Fuel Injection Pump and Oil Filter Housing.

Within the next hour I will be checking the Vacuum Connections compared to the pic in the manual. (However, I tagged my Vac Lines before I removed them so I do not sure how I could have connected them wrong.)

Will check with Vac Gauge also.

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84 300D, 82 Volvo 244Gl Diesel