Bosch Platinum plugs

My Duster 360 has been misfiring really bad,mostly while crusing.I know I need new plug wires but decided to remove a plug to look at them.I had no clue as to what brand they were since I didnt build the motor but saw they are Bosch Platinum.Can this be my problem?I read never to use these plugs in our motors.Anyway,I plan on replacing them with Autolites tomorrow.