Stereo in a 1998 mercedes benz c230

hi,you my ask assistance from your dealer were to repair your radio

hi I Josh my e mail is litosmechanicshop@yahoo.com I just installed a head gasket on a 1999 230 compresor when I installed the timing chain I put the crank damper on 020 and the pins throw the cam the problem I haveing is that when i drive the car it stalls and it gives me a hard time to start when the engine is on it excelirate normal and it has power I scanned the car and it had no code I checked it on data and found that the spark advance is on -19 and it went up to -10 can you help me out thank you JOSH