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Oh yeah....I believe that the reason you feel it in 5th and 6th but not in manual mode is that the torque converter is locked in auto 5th and 6th so you can feel the engine misfire. In manual it's not locked and that just makes it harder to feel the engine misfire. That's all based on what I...

I replaced all 6 coils and all 6 plugs at 94K miles. I am thankful to say that the problem is gone!

I would have SWORN it was the transmission but based on what I found on the forum, I replaced all 6 coils and all 6 plugs at 94K miles. Problem solved. Just thought I would report back on what I found. Just FYI..... Advance Auto Parts called for the wrong Motorcraft spark plug. The one they...

I have same issue....can't pin it down to the engine or transmission though.

Hmmmmm......we might have the same issue. I would not call it a vibration though (maybe it's not the same as yours). My wife calls it "kicking". It's almost like several abrupt surges or shifts, just some kind of "buck" in the drivetrain while cruising along. I put it in manual and the...