Question about Nissan Pathfinder

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1999 Pathfinder had codes Po325, P0172, P0440, & P1491 a few weeks ago. Now Service Engine light is off but car is running like crap. I think the 3rd cylinder is misfiring as the plug is covered in carbon & this came up in an earlier code. What it's been doing is stalling at idle. Starts right back up & sometimes will be fine but other times not. I cleaned MAS yesterday but that didn't help. If I clean carbon off 3rd cylinder plug, it will be OK for a short time. This has been going on for about a year but real bad lately. Any thoughts?

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