Hello, I have a Volvo 850 GLT with 180 000 miles. I have the following problem. When starting the engine for the first time (cold), the idle is okay. After a short drive, the idle start decreasing until it stalls. When I start the engine again and it is warn, there is no more idle problem. However I notice when the engine is warn and I accelerate a lot around 5500 rpm, then the idle increases a little bit around 1100 rpm. Could anybody help me? Thanks in advance, Pejip