I'll check the couplings again today and climb under the car to make sure my exhaust hasn't come loose or leaking. Did it again on the way to work while sitting at a light. The Short Term Fuel Trim was at 25% on both banks and went to 0% at the time it stumbled/idle dipped a bit. It's subtle and only last a second or so and then it goes away. Data logging on the Dash Command app is pretty awesome. Definitely coming in handy!
Thanks for the ideas - I'll post back so hopefully can help others.
James
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