Get NEW wires, period. The factory wires always go bad and cause misfires, anywhere from 30K+ miles on. THat would be right around your 55000 Km that you are reporting. Yes, there are some sets that last significantly longer but most don't and if you are having ignition problems it is just best to get a new set.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
