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Ticking noise at idle is usually normal for these cars (search for valve lifter noise, you'll find video with the offending noise, it is annoying but generally considered harmless).
I understand you have no codes anymore ? I'd start by cleaning and swapping the Vanos sensors (see DIY section, easy work).
Then use 2 cans of techtron in 2 different fill ups. Dirty injectors are a nightmare with the ethanol fuel we have now. If no improvements after the techtron, you may need new injectors.
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