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If it's a fuel related problem and your using a Holley 750 with the little Acelerator pump, you can install the 50mm pump and related cam fitting and get rid of that stumble. This is what I had to do to tune my crap holley....works good now..gets plenty of gas when you give it just a little pedal.
Check the Holley manual and it will provide you with numerous suggetions and fixes.
Bill
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