Trying to set idle and due to dieing when in gear after it gets warm. Need help.

Annnnnnd its back open. Idling in the driveway/garage is fine, even when putting git in gear. I drove about 30 minutes to an event yesterday with no issues. I stayed at the event for about 2 hours and then drove home. About half way home I got to a light and she died on me. She fired right back up but as soon as I put it back in gear without idling it up manually she died. So I basically finished the rest of the drive(basically with a police escort who liked the dart) two-footing the brake and gas to keep her from dying again. I think this week I'm going to start looking at all the vacuum lines and see if there are any issues.