Hi we have a 96 diamante v6. The problem is it idles way too high.What is the fix on this, something to do with a sensor maybe

 

Could be the speed sensor.

 

hi
any idea where it is and what the fix is

 

You can take the car to auto zone and they can scan it for free, if it turns out to be the sensor they will help you replace it. It is mounted on the throttle body and it is called the throttle position sensor, not the speed sensor sorry !