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Have you had a computer scan done. It is likely if a sensor or component is bad, the computer will tell you and save you the time of randomly replacing components. Low priced OBDII readers are readily available to home diagnosis. It would be a lot of things, crank position sensor, fuel pump could be bad, bad coil pack.
Most likely the dimmer relay. Follow headlight wires back to a small box on usually inside passenger side fender. This should be what is called a flip flop relay. This relay receives a momentary pulse from the dimmer switch on the steering column. This relay may be located elsewhere. You may be able to google images for your vehicle and "dimmer relay" you may get lucky and find a picture of it and it's location and perhaps the wiring diagram.
When was the last time you had the throttle body removed, cleaned and replaced? 90% of the time stalling, rough running, etc are caused by a dirty throttle body. Also, don't forget to check the obvious..when was.last time you replaced the air filter?
I would venture to say your stack relay is getting stuck. either that or you have a short in your low voltage wiring somewhere that is not always making contact....or it may be making contact through another median...like ice or frost. Remember electricity takes the path of least resistance.
But I would check the relay first. If its a stack relay or a closed type relay, try putting in a contactor that you can visually see if its closed or not.
You should be able to move the reversing valve wire from O terminal, (the changeover relay), on the thermostat to B terminal. I deal mostly with York
which O on the t'stat is normally open and B is normally closed.
On a Goodman the inside unit has a fan relay which is relay time delay sequencer. You have to have the right one or they do not work. They are located on the inside unit just as you take off the door close to the front. Now if you havea fan board that is different. You will need a service tech to replace that because you cant get anyone to sell you the board. The sequencer is easy to change but you need to get the right one. Go by the Model number. Go to parts house that sells A/C parts. Tell then you have a Goodman and need fan relay . You single pole double throw fan relay. You can call a service tech and ask for free estimate up front. Rus