I have a 1999 d2 w/188...miles I have an issue that seems strange to me and I can't solve it. When I start my disco she runs at high idle. Like it is in cold choke mode....best way I can think to describe it. After getting to operating temp the idle stays high and will not drop below 850 RPM. I don't know what could cause this. I have replaced cam shafts sensor, maf, and all four o2 sensors. Is there something that could be unplugged or stuck like a choke sensor?? Please help! I want to get my disco back to her old self...also on a side note it has dropped my mpg from11-12 to 8.5mpg...