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Old 09-16-2010, 09:42 AM
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NissanTech NissanTech is offline
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2004 Xterra
 
Join Date: Jun 2005
Location: California
Age: 52
Posts: 12,536
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Unfortunately your problem is a bit complicated and it is difficult to recommend replacing any parts without doing any test.

I had a similar problem last year, customer replaced 3 ECMs and 3 sets of coils (aftermarket) at the dealer and still had the same problem. Since the problem will take 2-3 months to developed, it was very difficult to duplicate once new ECM and coils was installed.

After installing the last set of coils and ECM at my shop, I suggested replacing the engine harness and add a grounding kit (similar to this one). It's been more than a year and the problem has not return.
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