Q: My car feels like its a washing machine until it just dies out 2007 Kia Optima

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The car will feel like it's a washing machine at low speed 30 and below. We changed the spark plugs but the engine continues to act the same. The last tech said it could be a fuel injector problem. what do you all think?

My car has 194000 miles.
My car has an automatic transmission.

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