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Rich Carbon Footprint V70-XC70 1998

My plugs have - a nice coat of carbon, I smell gas in my exhaust and I doubted that I would pass a emissions test, so here I sit in the garage. I am doing the swap out of all the pcv parts and have the intake manifold off. what else should I be looking for ? The car ran fine, started fine, drove well.
What about carbon on the heads, should I try to rid this with sea foam? The engine light is not on.
I am putting in new distributor ,rotor, wires , air filter, plugs are relatively new,- 4000 miles






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