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If it was the recirculation causes the problem could removing the upper hose a few minutes help to see if idling improves ? I know the hose is to drain/redirect the CC of excess juices puddling and “helps” oil the upper bearing but a quick test could confirm this. IF the upper bearing gets enough oiling from the fuel-oil mix one option would be to redirect the lower CC juices
To to bad two line hoses /tanks have been phased out… one could use one side and redirect the excess oil/fuel back to a modified tank to remix
see utubes on “purged oil collection” on oldies
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