Quote:
Originally Posted by WardL
I have mechanical secondaries and advance. I get too much bucking at low speeds. What I'm hearing from this debate is the mechanical secondaries are probably ok for me on the street, but I could improve the low speed driveability with a vacuum advance set up. Would I need a completely new distributor to convert to a vac advance? I can probably get some kind of conversion kit from MSD. I have a Bigs Stage 5 modified Holley DP. Sure knows how to suck gas! I'm a dummy so go easy on me....
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Ward, I think your low speed bucking is probably a lean idle circuit condition. Rather than swapping out any parts, try turning out the four idle mixture adjusting screws another half turn. If it runs better, then slowly turn the screws back in until it doesn't. Then back them out an eighth of a turn.
I have the same engine you do with a ProSystems 850 DP. No bucking or hesitation from 1500 rpm on up.