As it gets colder here in the Northeast my 90 Jimmy 350 TBI has been idling quite high (more than it used to last winter) when I first start it up. It's at the point that I have to let it idle for about 5 or 10 minutes before I can drive because the idle is up to approx. 2500 rpm (can't be good for the engine, or trans at stoplights). It doesn't happen unless the ambient temp is below 50 degrees or so and it seems to get worse as it gets colder. Someone mentioned that the Coolant Temperature Sensor (for the computer, not the guage) could be going bad. Has anyone had this problem? What did you do to solve it? Did the CTS correct the fast idle?