Transmission late upshift

Hello,

It sounds like you may have a plugged catalytic converter or a input shaft speed sensor that has gone out. here are two guides so we can see which direction to go in:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Please run down these guides and report back.