I just got to say thank you to all of you that replied. I changed out the injector holders, seals, and the idle air balance tubes. She is now idling very smoothly at about 650 rpm and she no longer has a miss or hesitation while accelerating. In fact, I cant remember the last time she ran this well! -- so thank you all and I hope this thread can help some people with their idle/hesitation issues.

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1985 500 SEL
170K - Near perfect condition!
---my MB is my baby!---