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Old 12-23-2002, 12:25 PM
Dalcorn
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I had a similar issue with a 1996 E320: idle surge and also a check engine light. fuel injectors were purged, O2 sensor replaced and the idle surge problem persisted. In due course, I replced a fresh set of Champion plugs (listed as approved in the owners manual) with Bosch plugs and the problem went away. It is possible that this resulted in reestablishing a faulty connection, but it made me a believer in Bosch plugs.
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