I had driven the 88 560 sel for about 50 miles with no issues. Last night the vehicle "missed" on three separate occassions. No rhymn or reason. Today car ran great. I have not changed the cap and rotor and will do so as they would appear to be original (102K). Should I consider the coil also? I hate just throwing parts at this annoying intermittant problem but it is the only thing that is keeping me from loving this car. I have installed new plugs, injector cleaner, cleaned cap/rotor (still quite pitted), air filter. What's next? Thanks in advance!

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Woody