List of things I would do.

Valve adjustment
Fuel filters and primer pump(if old style)
Replace ALL glow plugs with Bosch plugs
Check battery cables
Have battery tested
Replace oil with synthetic
Replace starter motor

Your going to find out that the car has not seen normal maintenance for 20+ years and the no start problem is a combination of other neglected items. My no start problem was a combination of a weak starter, glow plugs and battery cables.

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