Small vacuum leak? Vacuum advance diaphragm ruptured?
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Bob Allen, Kansas City
FlynShoot@aol.com wrote:
> I have a very curious problem w/my 77B. I have a Weber DGV carb, new fuel
> pump, fuel pressure regulator, Peco exhaust, Crane electronic ignition and
> Crane coil.
>
> The car starts immediately and runs beautifully. If I drive somewhere, turn
> the car off and have lunch, when I get back in it starts immediately but does
> strange things. The car hesitates backfires and generally runs bad at light
> throttle. When I give it more gas it usually backfires and springs to life.
> >From a dead stop and when there is a load on the engine, it behaves well.
>When
> cruising at a constant throttle or at light throttle, the engine misbehaves.
> The problem is definitely throttle position sensitive.
>
> I have changed the fuel filter, adjusted the floats in the carb, installed a
> fuel pressure regulator, changed the Crane ignition (but not the optical
> sensor), and changed my fuel pump. The timing is dead on, valves properly
> adjusted, and all new distrib. cap, rotor, wires, plugs.
>
> I am at my wits end.
>
> Does anyone have any ideas?
>
> DCS
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