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What I did windup doing is open my idle mixture screws a little and that helped my idle. But also what I think it did was got rid of some of the smell from my exhaust. I have always thought rich idle caused the smell, but I'm now thinking it was a too lean of a idle causing some of the smell? At least in my case.

Very good point as a lean misfire could certainly let unburned mixture out the exhaust

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