Ford 2001 Mercury Cougar Owner's Manual page 199

Roadside emergencies
2. Remove the jumper cable on the
negative (-) connection of the
booster vehicle's battery.
3. Remove the jumper cable from
the positive (+) terminal of the
booster vehicle's battery.
4. Remove the jumper cable from
the positive (+) terminal of the
disabled vehicle's battery.
After the disabled vehicle has been
started and the jumper cables
removed, allow it to idle for several
minutes so the engine computer
can relearn" its idle conditions.