2003 gmc envoy when i stop it wont go it just revs i cut it off n restart it skmetimes that works but its almost as if its not n gear bc ut will roll backwards in drive

Hello, sounds like a transmission engagement issue here. It could be an electronic concern in nature, but it could also be a mechanical internal fault. Hands on testing by a technician near you will be needed. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops