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Old 04-13-2017, 10:15 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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Neither of the parts you have replaced is known to affect the engine performance. The Catalytic Converter could affect the engine performance, but it's not likely to do it.

If your mechanic said that the problem was the Catalytic Converter and that didn't fix the problem, then he should give you the money back or try to fix it for free. He has to take some responsibility for the wrong diagnosis.

Unfortunately, there are many things that could cause the engine to run rough. Since I don't know the conditions of your Xterra or what you have done, here is a least of the most likely cause.

- Spark plugs and wires
- Oil level (make sure the engine is not over fill)
- Fuel quality
- Fuel Injectors
- Distributor
- Air Filter
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