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Hallo.
My way to tackle this problem with 260,000 plus kilometers on the clock would be to do the following..........
Take a master gauge pressure reading of the oil pressure to make sure it is correct .
Very high pressure indicates a bad oil pump relief valve and high pressure would pump up the hydrulic lash adjusters lifting the valve(s) of the seat causing a back fire in the manifold/exhaust and a dead miss. (Especially with weak valve springs.)Am finding some vehicles with over 200 psi oil pressure when cold and up to 300 psi with bad oil pump relief valves. Especially VW's........
Next check cranking compression and a leak down test.
Looking for a maximum of 10% leakdown.
Also look for weak or broken valve spring(s), this will cause all sorts of weired problems on a CPU controlled engine.
Also might check the voltage output and a ripple test . Am experiencing problems with some vehicles when a/c ripple is over 0.600 vac.
Although this might not uncover your problem this will eliminate otherwise simple things that can account for symptoms you are describing.
dk
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