Starting to notice some changes in my beloved Benz
 

I have started to notice some changes in my Benz. To give you an idea of what I have done to date since purchasing the car in April, I have done the following:

1. Replaced the rotors, pads and brake sensors
2. Obligatory oil, coolant and transmission fluid and filter change.
3. New plugs, wires.
4. New exhaust system.
5. new climate control.
6. complete changeout of fuses.

What I am seeing now is the following:

1. Idle surge, high idle
2. Surging on declelration
3. Occassional stall

I have done a search on each of the issues and I have tons of info on each of the problem , I guess what I need to know is if there is any single point failure that will cause the three or two of the three problems that I am seeing?

Problem evidently with the idle control system. Could be the OVP, this can cause it, otherwise the idle control valve itself may be getting bad. On this one I believe the CIS control unit controls the idle valve, not an idle control unit, but I could be wrong.

Gilly