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Reply to "UPDATED - Backfire under Low RPM / Load (4th or 5th Gear)....."

...Look for a Vacumn Leak.

Also try opening up the 'Idle Mixture SCREWS', just a Teensy-Weensy.

Could also be a Glogged 'Idle Air BLEED', Poke a Fine Wire down ALL of Them and then shoot them with Carb Cleaner.

Just sounds to Me like it's 'Fuel' Related.
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