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Old 01-05-2013, 05:50 AM
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75gmck25 75gmck25 is offline
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I have on O2 sensor installed on my SBC, and the stuttering you describe is usually due to the carb going too lean. When I was using an Edelbrock 1406 I could easily see the effect of changing step-up springs because it changed the point for the cruise to power transition. When the springs were wrong,(transition too late) under acceleration I would see the AFR go high (lean), feel the stutter, and then the AFR would catch up as the rods moved to the power step.

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