Hello,
This could be an issue with the overdrive switch. The wires that connects to the switch could be shorted out and making the overdrive be on and off back and forth.
This should be the first item to check. It is connected to the button that you press on the gear lever.
You will have to remove the gear lever to get to he switch.
Another possibility that you could have an issue with the over drive servo, that is in the transmission. To service that part you will have to disassemble the transmission.
https://www.youtube.com/c/2carpros/featured
I have attached diagrams for your reference.
Please let me know of any questions.
Thank you.
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Sunday, August 29th, 2021 AT 9:13 PM