Yes, You can adjust it too tight. Then, as an example with the 190E 2.3, you can see the throttle is moved off of its rest position (idle)

I have a PDF file that I can send you that has this cable adjustment procedure. If you need it, email me.

Haasman

__________________
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)