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P0300 is a general misfire with a rich mixture hitting the CAT while P0302 is pointing to cylinder #2.
The first place I would look is at the spark plug & coil for #2. Coils go bad once in a while but I've been carring my spare around for years without using it.
If those check out, the injectors are the next place to check.
Many parts are the same for each cylinder. Try swapping things to see if the problem follows the moved part.
Good luck and post back on progress to add to our knowledge base.
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'96 965, 16' wheels, Michelin Pilot Sports, rear 18mm bar + Koni, 201 HP cams, 142K. Put 200K on '85 745 TD.
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