93 300E 3.2 L Hesitation at red lights

[jeffandmaria]

I have 120K on a 93 300E 3.2L. The engine has no problems at all and runs strong. I have noticed that when I am waiting at a stop sign/ red light, the RPM's drop from 1000 to 500 and the car ascts as though it will stall. It still has not stalled however it shutters and acts as such.

I found that whn I drop it into Neutral though, the RPM's stay right at 1000 and there is no hesitation at all.

Someone suggested a "Idle Control Motor". Is this accurate?

Any suggestions?

Thanks,
Jeff