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Very unlikely that it would be a computer problem, it does not control the A/C, or temp gauge. Sounds like multiple problems. A/C could be just low on Freon, if pressure is low, it will not turn on. Temp gauge and rough idle may be related, if temp sensor is bad, the computer wont know the engine temperature and thus not mix the fuel correctly. But there are many things that can cause rough cold engine idle, like dirty throttle plate, or bad idle air control valve. You did not say what engine you have, so this is just general information.
Have you check for vacume leaks. This would make run rough but not set off you check engine light.If no leaks are found might want to change your vacume pump. Located in front of engine where all your vacume lines run to, Looks like a sm filter. This is usually priced less then $10, Good luck to you.
I have a 2003 ford windstar.Engine started to run rough when it
used to rained.I would accelarate it until roughness would go away sort of.It lack a little power but if I take it a mechanic they would charged too much money.Anyway, the problem was a spark plug wire in front of the engine, wires that are grouped together with that little pin. One of them was rubbing agains the valve cover and it got worned out current would leak out right there.I discovery it one time that it rainned really hard I had to go out and the wagon started to miss really bad and it wouldn't move.Finally, I got home the next day I looked under the hood to see what I can see and there it was a spark plug wire that one can tell if you know a little bit about cars that current was leaking throw it. I replaced wire problem solved.But now after all of that snow we had the check engine light came on and I am not sure what could be.For I remmerber running over a mountain of sort of hard snow.So it probably broke oxigine sensor wire.
Check the coolant level. If it's low, what you describe will happen. There is not sufficient coolant to flow through the heater core at idle. At 60mph the water pump is spinning quickly, managing to get some coolant through the heater core, so you get heat until the rpm's drop at idle. If it is due to low level, keep an eye on it to see if it drops again, as you may have a leak.
remove the coil pack and look at bottom of it if it shows any cracks coil is bad very common on these vans if you have a noid light check for injector pulse on #4 if you have pulse and good blue spark most likely the injector is bad you have to remove upper plenum to get injectors out let me know how you make out