SJM Auto-Technik checklist question

[Zsolt]

I am just going over some of the recommendations what to check on the turbo for a 10v I5, and have some questions.

Why does he recommend to replace the idle/WOT throttle switch, and fuel injector inserts/O-rings, and how much do they cost?
Can't they just be checked if they are ok?

Thanks,
  Zsolt
  88 5k tq 145,000km
  86 5k tq 250,000km
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