Hello.Am new here.Hope this finds you well. Got a problem with the automatic transmission of our Galant VR6. It stumbles especially on light acceleration. i was told that this seems to be a perennial A/T issue with the VR.( in that case this is an old issue but apologies for bothering you with ideas) I thought at first that it may have been a clogged fuel injectors since stumbling is one classic symptom of that prob. Diamond Motors thinks it is otherwise and thus diagnosed A/T as the culprit.

question:
1. can the AT be overhauled? is it a better alternative than buying a surplus? where therefore?

2. could it be just cleaned, filters/ ATF be drained then changed in the first place?

Thank you.