Also, on the BAT Auto Technical Forum, I had a fellow respond in this way, referring perhaps to a possible ground fault sutuation:
ok at my shop i have seen this problem ok i would change the fluid if this is a 8 speed use mobil 1 LV HP also and a bottle of Motorcraft XL-3 trust me it work's great on the shudder problem also a new filter now onto the can bus line issue on the driver side down by the frame you should see a big connector just below the manifold check there for a issue unplug and clean good and drive it again see what happend
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