Thanks again I have been thru about 4 or 5 pages of trouble shooting Using both the Mercedes manual and mercedes disc. They are different and can only see that the control box is slow applying voltage to the idle control valve. I was hoping to avoid just replacing parts without knowing for sure what is wrong. Acode reader if it had worked would have been offset by the cost of just the idle control valve,and it would have been nice to have. Once again thanks again I will just start changing parts when the budget allows it