[W126 Coupe] air mass meter or idle speed control issues

[Sarp Can Akman]

Hi I am sorry ı dont speak english very well ı speak a little .I have got 1988 560 sec . I change my airmass meter 1 month ago . İnstalled part moving out  1991 560 SEL and Used but runing good no problem. I have got 2 problem.When ı start the engine (engine cold ) My idle speed control unit works good first going 10.000 rpm then some seconds left going to 700 rpm. But when ı push to throttle engine stand to 1200 rpm .((How can ı do for this problem .I order new ıdle speed control unit then install problem not fixed .idle control unit runing good . I dont know how can ı check some point tanks I am so sorry to my bad english SaRp CaN Akman
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