Anyone ever have problems with Magnacores? I have a set that is probably 8 years old. They told me they would outlast my engine - little did they know I would have my car ove 10 years! I have a mystery miss that comes and goes away for days. Only happens when in overdrive. My experiance is telling me the spark is jumping off. Coil voltage is high when pressures are up in the CC. BTW, the coil pack is new.