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I've found the M103's are more sensative to ignition bits being in tip top shape then 117's/116's, 110's etc.. Usually by around 30-35K the rotor on my wagon was showing it's age (wear beyond what a good clean would tend to).
A note on the Bosch plugs, they will no longer be manufacturing the non reistor type plugs, so you'll want to stick w/ NGK or I've heard the Beru plugs are decent as well.
For an M117 I like to run W9DC's gapped a 42...
Jonathan
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