Will not idle

Any history leading up to this? Low idle speed is a common problem after the battery was disconnected or run dead. The Engine Computer needs to relearn "minimum throttle" before it will know when it must be in control of idle speed. Until that occurs, the engine may not start and run unless you hold the accelerator pedal down 1/4". You will not get the nice "idle flare-up" to 1,500 rpm at start-up, and it will tend to stall at stop signs.

To meet the conditions for the relearn to take place, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals.