Thread: engine stumble trouble

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Usually when an engine stumbles during the transition from idle to acceleration, its either a problem with the accelerator pump or a problem with the primary power circuit (I know Q-Jets use a spring, Holleys use a Power valve, I dont know what Edelbrock uses).

Check your vacuum at idle and buy the approriate power circuit spring/valve.

If it BOGS, then its your timing.

Are you running points ignition? Check to see if your points are pitted, or better yet spend the 10 bucks and change the points and condenser.

As for the RPM at 40mph, this is a result of gearing and has nothing to do with engine tuning. If you want it to rev lower, change the differential gears for 3.08's (at the cost of acceleration) or upgrade to an overdrive transmission. What would be even easier, just buy larger diameter tires..... You know old muscle cars look uber-cool with 17" Torque D's.

EDIT: Are you sure youre running 3.23's? That speed doesn't make sense with 3.23's unless you have a tire diameter of 18". Verify your diff gearing.