i had the same thing happen to me today. i tried playing a burned cd and it came up with the error20 and spit the disc out. tried a regular cd (store bought) and it worked fine. i tried the burned cd in the house and it played fine on the home theater.

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99 gtp
k&n/homemade intake, 180* t-stat, 605's, full tank of 91
14.7@92mph 2.1 60ft .290 r/t
141,000mi and runnin strong