Someone please help.
 

I have a 90 Gxl. it runs fine and everything. but after it gets warm and the engine is running at its optimum temperature, the idle goes way down, now i know its ok for them to idle around like 700rpms but mine goes all the way down to 5 and sometimes stalls. I dont know what the problem is. Does anyone think it could be a sensor or somethin thats gone bad? please help.