My 1990 Camry 2.0 lrt 4cyl just started having this problem. When running cold in the morning it runs at a high rpm before it shifts into the next gear. I would say it runs at 4000rpm when trying to shift from 3rd to 4th.
Once the engine and transmissions is hot it seems to run normally. I've taken it to a transmission repair shop and they said there is nothing wrong and it may be some type of temperature sensor somewhere?
Any ideas?
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