It could be the IAC valve which controls your idle rpm. It could also be a dirty throttle body that is not allowing the butterfly to operate without binding. I would start with the throttle body.
99 CSVT Green/Tan 13,700Km
# 84 of 2760
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96 Contour GL 2.5 ATX 120,000Km
K&N Air Filter
Mobile 1
E1 SVT Wheels & BFG G-Force Rubber
Aluminum Painted Front Grill
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