Okay - a new problem cropped up this weekend. It happened two days in a row when engine cold in the morning. Once was when my wife started the van and once when I did. I didn't even know she had an issue until I told her about it happening to me and she says "oh yeah, that happened to me Saturday morning too".
The engine cranks over fine and fires right up just like always - you release the key from start to on position and then immediately the engine dies. The RPM's dropped immediately from 1200 to 0 but all the instrument lights were lit just like you had the key in on position but not started.
It did this 4 times to my wife until it stayed running then worked fine the rest of Saturday. It did this to me 2 times Sunday morning and then worked fine the rest of the day.
My initial trouble spots to consider are:
1) Key switch problem, loses some kind of run or on signal when releasing the key from start to on.
2) Crank Pos. Sensor losing signal although I would suspect this more if it happened on a hot engine, not a cold one.
3) Relay problem, contacts dropping out on fuel or PCM relay feeds thus killing engine.
4) TRS - not sure this would kill the engine but others have had start / running issues with the TRS failing or out of position from reading other threads.
I appreciate any other ideas from the other board members. TIA.