Quote:
Originally Posted by nhramnl
I'm tending to support the "float too high" or "too much fuel pressure" suggestion. If the carb was fine but isn't now, your problem doesn't sound like a weather change issue. It sounds like a float that's too high (or the functional equivalent or that, too much fuel pressure) causing fuel to splash out of the bowl vent, into the primary venturis. If you leaned and richened it and the stumble wasn't affected, that would confirm that you have "uncontrolled" fuel entering the intake manifold. The car goes momentarily rich, stumbles and then gets on its way.
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Sometimes if the float is too high or too much fuel pressure , you can look down the primaries with the engine off , turn on the fuel pump and look to see if fuel is dribbling out the boosters . I had that problem , but could not fix it with a float level adjustment . I measured 7 psi fuel pressure . I did fix it by installing a new needle and seat . Edelbrock still sells the .145" needle and seat .