How do I check the base CO?

The injector buckets were changed with the injectors. Maybe one or two were not seated properly as Joe P. suggests. To get them seated, can I just tap them in lightly or push them down, or do I have to remove the fuel lines, etc.? What's the best way to get them seated properly?

It sounds like I should probably replace those air distribution tubes. I might as well replace the hose to the idle control valve too.

The air distribution hoses connected to the injecters, should I just pull-up on the tube to get it off?

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1989 420 SEL