Unless you've a dodgy cap or rotor, you shouldn't have this horrible corrosion to warrant the changing of either. Therefore you really don't need to go by the books recommendation until it starts to show. Is this correct?
On a side note... if the spark plug wires aren't cracked in any such ways and are old then, what is exactly could to hinder the electrical flow to the plugs?
Last edited by OblivionLord; 09-15-2007 at 10:50 AM.