Holley Guru's: I have a problem..

[Jefe]

I have a holley 650 vacume secondary 4 barrell on my daily driver 350. Mild cam performer intake, Mallory HEI, truck 4spd tranny..nothing crazy. When I give it gas it lurches or bogs down a little before it picks up and goes; or if I mash down the accelerator a little quicker than normal it will hesitate for a second. It hasnt always done this just for the past 6 or 7 months. I have taken it off and cleaned it, adjusted the mixture screws, even tried putting different accelerator cams on it and same result. I bought the carb new about a year and a half ago. Do I need to replace the power valve and give it a rebuild already? Any help would be appreceiated. THanks!!


Douglas.