No codes thrown when it was running poorly? Was it a damp day? Could be gas, condensation in the tank, moisture in the plug wires, etc.
I have had the idle shake (kind of a shutter) briefly on start up twice. Both times the code for Random Cylinder Misfire was thrown. Both times on damp, cold days. But then again, you probably still have snow up there in Vermont ;-)
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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT
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