How to disconnect the cruise from 2003 Dodge Caravan?

Hi! How are u?
i would like to know what's happiness to my van, it's hard to start when the weather cold I have to keep start over and over, when the car start up and it's show the cruise controll and stop running. That's why I woud like to know how I disconnect the cruise control. In the mupfler have a black smoke come up and smelling. After the car running, when get hot. The car run like new.I did change the new bateries and new starter, the old one I burn it because I keep turning to keep the car running.I bring to auto shop they tell me it's nothing wrong. But in the morning won't starts.

plese ! Tell me what's wrong.

thank you.