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Old 12-16-2016, 08:39 AM   #1
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1999SLLover is on a distinguished road
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Default Code 300 Random misfire

This site is great. I am new to it and hoping for some help. I have a 1999 SL I bought new and refuse to let die (I want at least 20 years!) The check engine came on and I have a code reader that says 300 random misfire. I have YouTubed it to death and have replaced plugs, wires, fuel filter and it still runs very choppy and is on the verge of dying (can't really get it down the street). Fuel pressure seems constant when running. A guy on Youtube said it could be the battery, but that seems off because it starts fine. Any thoughts? Thanks very much!!


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