Can anyone tell me the correct RPM speed at idle for a 1993 300E 3.2L 

So you are saying 700 + 100 - 50 this is in park correct? and if i need to adjust the speed is there a proceedure I need to follow
Thanks a lot for your reply I appreciate it
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Mine is M103 and the normal idling RPM range is stamped on a factory metal decal above the front dam (before the radiator).