Stalling when cold

Most likely the battery was recently disconnected or run dead. After that, the engine computer needs to relearn "minimum throttle" before it will know when it must be in control of idle speed. 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.

Next is to use a scanner to view the idle "steps" the computer has set the idle speed motor to. It can set it from step "0" to step "256". For a properly-running engine, step "32" is typical. With a single-cylinder misfire on a V-8 engine, you'll find it at around step "50".

If you find it at step "0", minimum throttle still hasn't been relearned. Try the procedure again while holding the brake pedal up with your toes. If that works, the brake light switch is misadjusted. If you find it at a fairly high number, the computer is trying to raise engine speed, but without success. Years ago a common cause of that was the air passage around the throttle blade was plugged with carbon. Today, with better fuel additives, carbon isn't a problem, so the next suspect would be a sticking idle speed motor.

You can also use the scanner to raise engine speed in 200 rpm increments. That will prove the idle speed motor is working. That is only for testing purposes. Idle speed can not be adjusted that way.