Transmission will not go in to automatic

The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems ca cause many drive-ability related problem such as rough idle and other symptoms

Your going to have to take the truck to get the transmission changed, change it now before it gets worse

If your transmission fluid level is proper then you do indeed have tranny hassles. U want to have that taken care of lest you get stranded at worst time.

could be fuel management or engine idle fuel level or automatic choke.

I would not conclude you have a trans problem,as some other issue maybe be confusing the shift stratagy.
The temperature issues and time driven are the key here.
I would check for stored codes first.
Then go over the basics-Spark Plugs,Ignition,Egr Valve,Vacuum Leaks,MAF Sensor and so forth.
Clean up the engine driveablity issues first.

Becareful when considering changing the trans fluid. That will not fix anything and may cause it to slip more,if you get to that point in your testing

The time parked is not a concern ,as I feel these issues where there before.
If the engine is not running correctly ,you will get just what you discribed,with the shifting up and down

if the 5spd engine is still good, you have to buy a manual transmission for that engine.

is it manual or automatic. If automatic bands might need adjustment. If manual maybe the clutch disc is not good does she smell like if something is burning when car is running

check transmission fluid.change fuel filter and air filter.try changing up on where you buy gas .because bad gas causes problems.

Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the Check Engine or Service Engine Soon lights to tell you that there is a problem and you should have the car diagnosed and repaired. Not fluid related, but could be a small problem that's easy to fix now. Even a loose gas cap can turn the light on. Have a code scan, that's the starting point.

change your sparkplug wires that will salve yor problem