FORD F-150 COMPUTER REPLACE/REMOVE

How Do I Change The Con­trol Mod­ule On My 86 F150

I Bought This Truck Know­ing Some­one Had Put A Af­ter Mar­ket Tuner Mod­ule In It. The Truck Was Not Run­ning Right So I De­cided To Take This Out...

My F150 Truck Will At Times Shut Down To About 30mph. I Am Told This Is The Com­puter Think­ing The Veh Is Run­ning Hot. In Fact It Is Not...