2004 Kia Optima

Engine Performance problem
2004 Kia Optima 4 cyl Four Wheel Drive Automatic 95000 miles

when driving the car all of a sudden the rpms will jump up from 1 to 2 and then go back down it just starting doing this could it be bad gas?Whats your best guess? Thank you
Diane theriault
June 24, 2008.

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