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The hole in the bottom of the idle jet will generally become blocked before the idle discharge port because the fuel hole is dimensionally smaller (ie .55, .60, .65 mm) in the jet where the foreign material is picked up VS the 1.00 mm discharge port in the throttle bore. If you find your engine suddenly running on 7 cylinders (or less) inspect the idle jets first.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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