is it losing collant? check for oil in coolant or coolant in oil. if so it may have a bad intake or head gasket. if it only idles rough when it gets really hot and the coolant level is okay you probably need a thermostat or possibly a new radiator.
e.g.r. valve replacement fixed mine. symptoms where rough idle and "surged".
If an alternator is going bad it can cause a rough idle in a 1993 Subaru Legacy. Cold temperatures in the winter can also cause a rough idle in the Subaru Legacy.
The 1998 Blazer could have several problems causing rough idle. Check the air filter, fuel pressure, and EGR valve for a clog to look for the problem.
It will overheat at idle.It will overheat at idle.
There are many things that can cause a rough idle on this car. The computer could be going out, the engine may not have enough oil, and the engine may not be getting enough fuel or electricity.
rough idlingTry cleaning the throttle body with throttle cleaner and tooth brush. Remove the cover first. Soot builds up in this area causing the flap to stick resulting in rough idle. I have cleaned mine to new condition and I still have a rough idle. The dealer told me these motors never idled very smooth in gear.
Its idling rough because you probably have a blown head-gasket and lost compression at two cylinders you need to remove all spark plugs and check each cylinders compression.
Why does my 2001 kia sportage idle rough?
rough idle smell gas
why does my vr commodore idle rough when at complete stop
no it can not.
Wouldn't be your thermostat, its going to be the fan motor for your cooling system. Because the wind that hits the motor while driving cools the motor but when you come to a stop and idle there isn't anything to cool the motor