When cold slow to upshift from 1st then occasionally shudders on 1st to 2nd change. zf4hp14.
ZF is good trans- but if you continue
to or have been using it- with problems,
you may as well pull it & rebuild it
I would hope you checked for codes
OBD 1 maybe that won't happen
On the internet is a lot of info
Google the trans
Google questions
Go to You Tube Video-I have watched hours
of trans rebuilds & what your asking there
I once owned a trans shop
I have no info on your car or know what if
any electrical or electronics are involved
But from what your saying & my experience with
lesser quality trans than yours,I think it has to come apart
Could try cleaning the valve body
If it has been in service for 10 years or more
& a 150,000 miles pull it
No fluid changes every 3 years,it's toast
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