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Edels also hate any vaccum leaks. Even the smallest seems to screw them up. You might try taking a look since you are there. I use ether to check. Don't know if the even sell it anymore. Just a light spray around and see if the idle changes. Old school but works. Todays starter fuild should do the same. I have a 1407 on the SD I just got and cannot wait to switch it out. Found a small crack in a tube cover that had it loading up bigtime. Similar issues. Ran fine under throtlle but started loading up at a steady rpm.Might be Sunday's project. Today was all cleanup, I hate cleanup days:(

You mention the plugs, what did they look like? Any signs of fouling?
 
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