Sticks in third gear sometimes

2002 KIA OPTIMA
194,000 MILES • 1.8L • V6 • 2WD • AUTOMATIC
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DAVID1122
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Hello. Newbie here.
My car sticks in third gear occasionally. Not every time I drive it, but now and then when it is in fourth or just in cruising speed in town.
Recently, I had some odd occurrences with the electrical system. I cleaned the plugs, connections and terminals. On finding nothing wrong, I noticed that the frequency of the third gear shifting happened more often. As if it was getting more sensitive.
I don't hear any unusual noises from the transmission and other than the rpm's running faster than usual, it runs smoothly.
Thoughts? Questions?
-David
Jan 15, 2019 at 7:06 PM
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STRAILER
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Yep, they do that when they need to be serviced. Here is a guide that will walk you through the service:

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Please run down this guide and report back.
Jan 16, 2019 at 4:52 PM