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#1
03-10-2020, 01:21 PM
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Sounds like a fuel issue to me.
Is your gas cap "Vented"? New fuel pump? I had that problem on a 440-4....ended up being the Carter carb.....but you have tried two carbs already....Hmmmm 
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#2
03-10-2020, 02:03 PM
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Couple "sound" shots:
Ignition, increased resistant when heated up:coil/ballast resistor.what do the plugs look like ? Fouled? Starving for fuel? Whats fuel pressure when it starts stumbling? Vacuum leak? Controlled port opening? Just some thoughts.
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