I have a 1994 single turbo with aem ems etc. Started a couple weeks ago where i would fire up the car and the idle would shoot up immediately to 2 grand and not drop until I turned off the car. Turn the car back on and it would idle fine. Recently I would turn on the car and it would idle fine and when it got hot it would idle back up to 2k and will not drop. I changed the plugs and serched for vacuum leaks and everything seems fine. It also seems like it is running a little rich. I tried lowering the idle, but I know that is not the thing to do, when I do do that it has a very rough idle. Thanks for any help.