zrone, note that failure to maintain the ignition system components (sparkplugs, wires, distributor cap, distributor rotor and coil) can cause the ignition control module (ICM) to fail. Paid $1,750 for a new ICM for our daughter's 1991 300CE when the original one failed.

Be sure to check the maintenance records for evidence of routine maintenance of the ignition system. In the absence of records it would be wise to inspect all the components and replace, as required.

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Fred Hoelzle