The best thing you can do is remove the bad one and take it to an autoparts store to see if an aftermarket source has one. Dorman is one such maker. If you have to repair the one you have you will end up having to test the resistance on the rheostat and see if it can be duplicated.
SOURCE: 1989 dodge ram 150 5.2 motor shutters
Start the engine and get it up to operating temperature. Take a spray bottle with water in it and spray the vaccum hoses and around the intake gaskets. If the water affects your idle, you possibly have a very common intake gasket leak. That motor is well know for vacuum leaks around the intake gaskets. You can also try spraying carb cleaner, but be very careful with that. Hope this helps. Sounds like a vacuum leak to me.
SOURCE: my dodge ram truck will not turn off, it continues
if its diesel there is a fuel shut off solonoid that goes bad u can use ur fingers to lift the arm and the engine will die. the solonoid is located on the drivers side toward the rear of the engine. the arm points strait down. pull it up to shut the fuel up (caution sometimes the arm will spring up snappng ur fingers keep fingers underneath the solonoid arm
SOURCE: got 1989 dodge ram van 5.2 at idel it run rought
Check for a leak at the intake manifold you can use some soap in a spray bottle spray along the intake and heads it will change the idle if its leaking
let me know if this helps
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