XG 300 will not accelerate past 20mph

Last post on Oct 18, 2009 at 11:05 AM

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#1 of 1 XG 300 will not accelerate past 20mph by t2justin Oct 18, 2009 (11:05 am)
Help my 2001 Hyundai XG 300 will not accelerate past 20 mph sometimes and then when it does it is kind of jerky. Can anyone tell me what might cause this and how much it would cost to fix?