Q: It is not running well, and the body is noisy when it is moving

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I have 2002 Hyundai Sonata 2.7l and its company replaced the front sub frame 2 weeks ago, and the tire pressure is 28.when I drive it. It needs more pressure. What happened? Could you tell me more about it?

My car has 115000 miles.
My car has an automatic transmission.

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