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Our '12 Sonata Limited had a replacement engine a few years ago. Now, it don't stay stable with speed up the hills, it felt like it is running out of gas climbing. A bit soft jerk, the RPM went up high nearing the red line. What's the problem? What's the solution?
 

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Problem: Its a Hyundai.
Solution: Trade it in for another brand.
 

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Driving from Abilene, Tx to Phoenix, Arizona next Saturday. I-20 to I-10 to Phoenix. I've done this trip a couple of times in the Sonata and it has no problems on hills. It did spend some of time in 5th and a little in 4th (around Tucson), but I never remember the tach getting above 3000 rpm.

I'd have a good mechanic look into that.
 
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