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Don't discount the plugs. I just weeded a set of Bosch platinums out of my engine because of poor performance. At less than 2k miles, the engine became hard to start, stumbled, popped and generally ran poor. The plugs I pulled out had major carbon tracking. It was as if the resistance dramatically increased with age. I'll never know why they did that but the NGK plugs I now have are just fine. Hope this helped.


When's it sputtering?
 
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