Sounds like fuel, it comes right back after the rpm decreases below the problem rpm? Have you check rotor phasing? Msd has a good video on it. Mine was just like the before video! DOH! Also check the burn pattern on the distributor terminals. Is it in the right spot? I chased this for a good bit of time!

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Last edited by FurryStump; 06/22/17 04:40 PM.
best of 11.24 at 119 mph 1.60 60’. 68 340 S Barracuda Fastback F.A.S.T [IMG]http://i67.tinypic.com/2mnnnnt.jpg[/IMG]