Ford Mustang 1995 trouble code P1505

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#1
Idle air control system at adaptive clip, does anyone know what this means? The car drives great even when the check light is on. When I drive the car it never comes on, I drive maybe ten miles twice aday. When my partner uses the car, she starts and stops the car every two or three miles maybe ten times a day, the fault comes on within two days. Please help?
 
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#2
It might mean that the idle air control system is trying as hard as it can to compensate for a problem that affects idle speed. Check for a vacuum leak, dirty throttle body, or sticking throttle body plate or rod, or binding throttle cable. Also, Fords are notorious for problems with the idle air control solenoid. Usually cheap and easy to change. You do not mention which motor your mustang has.

Dan