Re: Improve mileage 350 with Quadrajet
Your vacuum is probably hooked to ported source. Ported means vacuum from above the throttle plate. Zero at idle but starts to supply vacuum once throttle opens. Try hooking to a full time manifold vacuum source to check your vacuum advance. You have a spot behind your carb that has a line with a screw in it.
Lpg likes lots of timing. You might need to turn your idle down since it's running faster now. Idle adjustment screw is on linkage on drivers side of carb.
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