Dallas, Honda Factory Certified Tech Here

First How Many Miles On the Van?

04-021 is a MAJOR recall on the last gen of odys. the second gear assembly gets deprived of fluid and Heats to the point of destruction (over period of months) then causes a transmission Lock up.

Your probleem sounds like an upshift issue. which on odys is not good, most likely trans replacement (ODY original transmissions are complete peices of @#$@, the HONDA remans Are good)

Catalytic convertor Might Be under Recall Emmisions Extension Still, EGR as Well,
In fact you just listed the most Common ODY problems. Honda Has been cleaning up those messes for a while now