Roym, thanks for updating us on the fix. I had that exact same problem on my previous '05 4.4. It only did it in the morning but man did it buck like crazy. I found that if I pressed down on the accelerator it would smooth out. However, it still wasn't right.

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2006 4.8iS Black/Black with custom Audison Voce/Image Dynamics sound
Production Date - 10/05