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i think that you need another fuel distributor.there is too much o2 in the exhaust and that is probably from one or two cylinders not getting the same amount of fuel as the others.if correct you should see o2 levels down to .2 or .3%.try running engine at idle in gear with emergency brake on and open the fuel lines at the distributor one at a time and see if one or two don't make much diff.
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