The shudder is clutch chatter and that is what it will cause. If there
was a tendacy to miss fire it would be present at other times too and
the chances of it being timed excatly the same evey shift to cause
shudder is very slim to nothing. This is a tranny isse not engine and
with itself mileage he has done well and gotten a good life span out
of it (well above average) and it is time for some attention.
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