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As already posted above fuel spark compression.
Check if your fuel pump is turning on when cranking ( put your hand on the pump ). If not change the DME relay and she will be sweet.
If it is turning on then I would check your distributor cap and rotor. then check for spark.
If that fails I would give your injectors a few small tap's with a hammer ( not hard just a gentle tap will do) as they tend to stick after a long rest.
If that fails then you need to get out the big guns and start with checking the fuel rails for oil ( from the earlier accident with the oil in fuel), if clean then check pressure. If pressure is low you can start with the fuel filter inspection. It will tell you if you have to drain and clean the tank and fuel lines.
If pressure is good then you need to start looking further at ignition, replace the plugs ( probably not needed but at least you can eliminate them from the problem) they have been sitting around for ten years, probably clogged with old oil residue......
If you still cant get it to run. best you take it to a Porsche work shop or put it back in the garage for another ten.
Best of luck
Alx
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