Slow return to idle can be caused by:
Vacum leaks, Throttle linkage, Throttle body or the Air intake system.

Low or slow idle can be caused by:
Vacum leaks, IAC, Air intake tubes or Wiring connections.

1996 2.5LT V6 Contour ATX My Tour+help/info pics E0 rims, Gutted Pre-Cats,CTA Custom Exhaust & Intake, Diablo Chip.