i purchased a 300ce about 11 months ago all original,it had 65k on it and now has 68k,it runs pretty good other than a bad eha valve,im wondering though should i replace the cap ,rotor, and plugs now,i know it couldnt hurt right? i was reading allot on here about resistor/no resistor plugs,whats the difference,i was thinking of bosch platinums,whats a good plug for a 103 engine 1989,thanks guys.oh is 300 miles per tank of gas ok? i noticed when i regapped the plugs it ran a bit better.everything is original,plugs wires, cap, rotor, plugs.