1996 Ford Taurus need help, travelling and car is having pr

Electrical problem
1996 Ford Taurus 6 cyl Front Wheel Drive Automatic

Hello I'm having trouble with my Taurus and need help I don't know much about cars. These are the symptoms I'm experiencing:
-sometimes wont start right away, just turns over and dies, needs gas to start most of the time
-idles very low and ruff, below 1000 rpm
-lights dim in and out especially when first starting up or when idling
-when first starts up there is barley any acceleration even when peddle is to the metal.
-brakes give out when idling low and sometimes just stalls out if not given gas
I have tried replacing the battery, cleaning the spark plugs and testing the alternator with a multimeter while running the car. It helps it idle higher when I put it in neutral when at stop.
I'm homeless and traveling and living in my car so I cant make a donation but would so appreciate any help so that I can try to fix the problem myself.