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Old 07-31-2005, 03:58 PM   #14 (permalink)
pm220b
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Date registered: Aug 2004
Vehicle: 1963 220b
Location: Milford, NH
Posts: 41
RE: '71 250 Backfiring through the Carbs

my idle jets were loose. when I tightened them in the idle mixture screw startrd working
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