Car turns off

I am not understanding everything you did, but if you removed a battery cable, the engine computer will have lost its memory. Most things will be relearned automatically, except "minimum throttle. Until that is relearned, the engine may not start unless you hold the accelerator pedal down 1/4", you will not get the nice idle flare-up to 1500 rpm at start-up, and it will tend to stall at stop signs. To meet the conditions for minimum throttle to be relearned, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals.