[newbievueowner]

Check all your engine grounds for a break. I had something similar to this happen on an old Grand AM I once owned. It idled fine but once placed into drive it would just die. Tracked it down when pulling on the wire harness while idling and it died, the ground wire was broken making an intermittent connection. Fixed that and it ran like a champ.

Not saying this is your issue but something to look at.