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Im not an old timer but ill throw my $.02..
The oil filter on the car is for a 944 I believe. I do not know if the internal pressure relive valve is approved for use on our engines. Also @ that mileage a new oil pump would not hurt anything.
Inspect the knock sensors for cracking. once the plastic casing on them begins to crack I dont think they are reading as accurately. Thats when I replace mine anyway.
If the intake manifold bolts are loose that may be giving you the egr and or maf codes. a vaccum leak in the intake system can cause a few different problems. inspect the gaskets for damage. or replace them just to eliminate the possibility of problems.
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