just got back from a friends shop. he was working on a '92 300se or s320.not sure which engine but year is right.anyway,he repaired leaking head gasket and cap/rotor.afterwards,when he would rev it past 1800-2000 rpm it would ~chug.started to look at harness and the insulation was cracking and breaking off.i had heard of these problems before but thought it was limited to e-class.now,obviously not.is this a straight six problem or can i expect the same from my '95 s500 v8?

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'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)