Well I wanna to think you guys for your help , I went to the dealer and the guy was kind enough to go outside in the parking lot to see what I was talking about , he told me it was a thermo-vacuum I ask him if that would cause my car to hesitate he said that it is possible the thermo vacuum sort of act like an egr valve how accurate this is i have no idea anyway the part cost $14.50 at the dealer i took the part # from him checked with fastlane it is $12.00 so i ordered it from the dealer.

Looks like the captain was right . thanks everyone