I'd leave the tune alone, to me sounds like a poor connection or possible ignition issue. You can hit the wires with a quick mist of water from a spray bottle. That should atleast rule out an errant issue there. Night time usally works best to see cross-firing etc. Sometimes a cracked plug can do the same thing.
As Greg pointed out, I'd double check the connections in the distributor and injector harness. Usually a misfire or stumble should show itself in the O2 log. If your not seeing it, maybe you need to look to the opposite bank for possible issues.
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Dennis
Moore Racecraft
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