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The details for your Motronic 1.8 are a little different from my car but in general the system has a solenoid valve run by the ecu on the driver's side fender I believe. It feeds/controls vacuum to the valve located on the other side of the engine via a plastic "pipe" routed over the top of the engine. Look for broken/rotted rubber connectors between components as a first step. A hand operated vacuum pump is a great tool to have for deeper investigations.
If you find one, the connectors are less than $3.00 at the dealer or use appropriate sized rubber vacuum line sections for a temporary fix.
Good luck & post back with your findings.
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'96 965 with 16' wheels at 121K. Had '85 745 Turbo Diesel for 200K.
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