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you have a lean condition gong on
when you put the air pan on ... it has turbulance and running lean. need to jet up or put the filter back on and try it.
Had same condition on my dart.

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put the air cleaner back on and seemed to help a bit but its still breaking up a bit, so the search goes on

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Mike, is this "breaking up" all the time , only at WOT, or top end only? I ran into this a few years back on my Dart, tried jetting, diff plugs, redid all my ignition grounds, checked dizzy shaft for too much play, everything I could think of with no luck, even swapped in my back up 6AL. Then after reading an article about dizzy phasing I decided to check it out. Turns out it was firing JUST before the rotor moved past the electrode for any given cyl. So I corrected that and the breaking up or miss was gone. Mine was a topend miss just about the 1000' mark to the stripe. Just a thought.