3 instead of 4 what? Cylinders? Gears? If you think you've lost 4th gear try shifting from D to 3 when you're on the highway. If your rpm doesn't jump up, you were already in 3rd. Trans logic learns how you drive and if you're driving at high pedal % all the time, it will shift at high rpm, that could be all it is.
If you're running on 3 cylinders, you should throw a code.
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Moved on to smaller and better things.
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