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Try run the vehicle without Drive belt. Sometimes it could be an accessory pulley being out of balance.
Or maybe a bad Harmonic Balancer itself, which I've seen a few times. Pry on the Harmonic Balancer, see if the Rubber parts are worn out and falling apart.

 

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I have the same problems on 2007 charger rt. At stop signs my car rpm will drop and the car would shake. I have no idea whats wrong with the car. Have you solve the problem?

 

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I put in a new rack switch as well, didn't solve my prob with low idle but it does pick up rpm when I move it right to left at a stop to make the low idle shake go away

 

Hey guys, I'm new to this fourm and glad to be a new member. I have recently just noticed that my 2nd gen. neon has just started to have this low rpm idle issue. it did not occur before. however, I notice that it happens when my car is at normal operating temp; then out of no where the car drops to about 500 rpm's. I thought it was an IAC, but, I tested it and it checks to be ok. although, while I was digging around by my TB I found that I had oil in my intake manifold. could this cause bad combustion and cause the rpm drop?

 

So, what's up with deleting all of your posts in this thread? Can't help with the "update" of the problem when you delete everything, making this thread useless to everyone now...