1986 Ford f150 Idles High when heats up

I have a 1986 Ford f150 truck, it idles high after it heats up. I have replaced the idle air control valve wih no change. Does anyone have any suggestions?

Thanks T

Auto Zone and Advanced Auto will scan the engine for codes free. The T-P sensor sometimes goes bad but normally the idle speed goes up and down on its own.
Post any codes you get so we can look at them.

Check if the throttle shaft in the throttle body moves freely.It could be sticky.Pull the cover off and move the throttle by hand without the engine running.

i belive it's your tps thats gone bad because it has about 3 steps when you start it up and it will kick down a notch then another notch until it idles like it sould. but my money is on tps or module.

Might check for a leaky intake gasket. Spray some carb cleaner around intake while running and listen for a change in rpm's.

sounds like a throttle position sensor im not sure if 86s used those tho i had the same problem with my 92 and thats what is was mines fuel injected tho

sounds like a throttle position sensor im not sure if 86s used those tho i had the same problem with my 92 and thats what it was mines fuel injected my dad also had the same problem with his 88 there not that expensive like 30 35 bucks and i would bet my money thats what it is

i have 1986 ford f150 and the starter stays engaged after starting the truck its a new starter,i am not sure if the solinoid is bad or not

I would take a 12 volt test light and monitor the small wire going to the solenoid. If it stays on after starting I would check the ignition switch and relay if it has one.
The bendix may also be hanging up but check for voltage first.