At what point in time should the plugs be changed. the car has about 71,000 miles on it. the plugs and wires and cap and rotar are all the orginal as well as the plugs. The care runs great. Just norm maint has been done oil every 3,000 and had a trans svc done at 60,000 a power flush svc. we are going to do a coolent svc this week as well
