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Q: How do I know which computer to replace? on 1995 Mercedes-Benz S320

My car keeps blowing ignition coils, runs rough, and lacks power. My mechanic told me that it's my ECM. I've gone online and seen that there are 2 computers. Which one should I replace?
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I do not have a lot of Mercedes experience if you are having this problem before replacing a computer I would send both computers out to be tested. Tehre is a company I deal with here in California, very helpful and quick turn around, Fuel Injection Corporation ,2407 Research Drive, Livermore, CA 94550, Phone: 925-371-6551. Give them a call. I called them before with a Jaguar, BMW and Alfa Romeo the fellow I spoke to knew exactly what was wrong and fixed each problem.
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