Dead Spot At Idle
What ignition system are you running on your engine? If you are running a vacuum advance HEI distributor you may be having an intermittent open in the pickup coil when vacuum immediately drops when the throttle is opened. Also, along the same condition you may have a ground wire problem with the point plate if you are running a point style distributor. If you are running a vacuum advance style distributor, disconnect and plug the vacuum line and see if your condition decreases. Also make sure that your initial timing is adjusted. I would recommend 10 to 12 degrees advance as a starting point.
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