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Sharon

2010 Corolla problems with hard down shifting

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Corolla issues

I have a 2010 Toyota Corolla with 97,000 miles. I am asking about hard shifts. From a stop and accelerating from 1st, 2nd, 3rd, and OD, all is well and no issues. The issue is with downshifts from OD to 3rd or 2nd, especially when I need to pass someone. I will give a decent amount of throttle and it drops out of overdrive and waits... Then shifts into second. Almost like it missed third gear altogether and went to second. On the times it does find third, it lands into gear pretty hard and you can feel it jerk into gear. The concern is not only that something is wrong, but it's also starting to cause a safety issue.
This issue isn't constant and I can't always recreate it. Some days it drives like a brand new car and other days it seems like it's time to trade her in? I bought this car new and was hoping to drive it for many years not just 10. I’ve always maintained it, used premium oil and it’s in otherwise mint condition.
I'm running the original spark plugs. I started to think that maybe a general lack of power due to old plugs is causing an issue where the transmission is making up for the loss by shifting me back an extra gear when in normal conditions it wouldn't do that?. I'm honestly not sure. Any thoughts or suggestions would be welcome!
Sharon


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