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How will I know if I have a blown power valve in my 850 D.P. Holley?I have a whitish gas smelling smoke that comes out of mostly the primary side of the carb when I shut it off.The car has been popping out of the carb lately when I try to start it and runs like **** for a little while . I changed the plugs recently and it seems like it is running rich lately .I havent messed with anything it just started acting up.
Bob
 

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normally, a blown power valve will cause extremely rich idle mixtures and poor part-throttle driveability. Kind of acts like the choke is stuck partially closed. Hope this helps shed a little light.
 
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