89 ram charger high idle problem

[72*birdman]

my buddy has a 89 ram charger. 360 auto with First year fuel injection. that has a idle problem. if you set (like in a drive thru)with it in gear or park it starts to idle faster & faster even though its at running temp. anybody have any cures or know what may need replaced.

 

[bear]

Throttle position solenoid ?

 

[bear]

I just thought of something else . Does the truck have cruise ? Make sure it's off and those years are known for causing problem's .