Its been a crazy 10 days, by this past Monday evening I took my car to the garage because I could only get 30 mph. Hold light flashing, and engine light flashing. Yesterday I received a call from the shop, its 2 things. First the lines from the tranny to the radiator are leaking, hopefully a easy fix. Secondly, for the misfires, darn valve cover gasket. So I bought one of those and now I am in repair mode and hopefully get going. My question should I replace wires and plugs or just clean them off?