1998 Lexus GS 300

Engine Performance problem
1998 Lexus GS 300 6 cyl Two Wheel Drive Automatic 170600 miles

I wanted to know what is the the problem with the gas peddle not accelerating. I had the diagnostic code checked and it read codes p1120 and p1121 I wanted to know who I can take it to get repaired and what something like this would cost to fix. Just purchased the car and unfamiliar with repair shops that can perform the work.
April 7, 2010.

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