1997 Volvo GLT starts and stalls

I drove the car to get parts, shut it off, and it would not start. It would fire on occassion, but not run. I took it to repair shop, it sat for 2 months, now it will start as soon as you turn key, but dies suddenly in about 5 seconds. It will continually repeat this. Originally no engine light on and I could get no codes (I have a very good reader and do a lot of work on my cars, Volvo, & Subarus, and Chevys) The independant shop it is at checked their data base and it listed a possible bad connection behind glove box, which they checked all connections and no change. I did have the radio out, but not unhooked and replaced, I did check connections on radio again and they seem ok. I recently bought this car and it has 140k. It did run fine prior to this. A visual check of all wiring appears fine, not repairs, frayed, or damaged seen. It is the 5 cyl turbo. When it does run, it seems to run smooth for the 5 seconds. The length of time it runs does not vary. Thanks!