Thread: Edelbrock Stumble when stompped.

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71 Nova, I must say that if you don't want to change anything on the engine except tune the carb, than you definately won't see your potential for performance. If you are going to leave the thing the way it is and just tune in the carb you might gain minimal performance but it will at least run better. Start out with the car not running. Set the ignition timing at 0 on the harmonic balancer to the number one cylinder. Turn the idle mixture screws all the way in and then start out at two whole turns out on each side. The car should start but you are not done yet. Put a timing light on the thing if the idle is around 650-700. If it's idleing to high than turn the idle speed screw out until your around 650 rpm. If it doesn't want to idle down then you got a vaccum leak or something. If it does come down nice, then set the timing light at about 8 degrees BTDC. Once thats set, take off the timing light and install a vacuum gauge at a manifold vacuum source. On an Edelbrock it on the front of the carb, to the left of the idle screws. Hook the gauge there. You want to achieve the highest vacuum signal at the lowest RPM. Once you have a steady needle, hook your distributor advance to that same port. Drive it, and if you do all these things it will run much better. Other than that I have to know all about the rest of the car. BB