Hyundai code on car... does anyone know?

I took my car into a shop today to get looked at since my check engine light was on and they hooked it up to the computer and saw 2 codes. the one was a soft code and went away but the other one kept popping up and the mechanic wasn't sure what it meant. the code was.... P0011 (ACMP timing over adv'd and/or... show more I took my car into a shop today to get looked at since my check engine light was on and they hooked it up to the computer and saw 2 codes. the one was a soft code and went away but the other one kept popping up and the mechanic wasn't sure what it meant. the code was.... P0011 (ACMP timing over adv'd and/or sys performance error) does anyone know what this is? I have a 2001 hyundai elantra
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