high CO and HC at the same time usually points to excess fuel. Not just a rich mixture. You could have vacuum leaks as well which will lean the system out. If your ECU compensates for the lean mixture with more fuel you get high emissions all over the place. The first place after the tune up parts to be positive about, is the vacuum system. Make sure all vacuum hoses are in order. Then from there look at the fuel injection. Make sure all injectors are working properly. Start with the simple things then move on to complex parts.

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Chris
84 280sl
82 300d euro