Any Ideas ?????

hello everyone,,,had kind of a strange thing happen the other day and was looking for everyones input...i have a 95' aurora with about 100,000. i've owned the vehicle for about two years..a few days ago i went out and started the car and it made a backfiring noise from the enging compartment..at that moment the check engine light came on and the car began running EXTREMELY rough..it was almost non-driveable..it would stall frequantly and the rpm's were all over the place..i drove the car down to the local mechanic and he immediately thought a vacuum line was the probable cause..after inspecting,vacuum lines all looked ok..he then attempted to scan vehicle and pull the trouble code,but dide'nt have the correct scanner for a 95'...i drove the vehicle back home where it continued stalling and running extremely rough..when i got home i turned vhicle off went inside for about half hour,came back out and restarted vehicle...check engine light was off and vehicle was running perfect.any ideas ?????

Sounds like the EGR valve may have been sticking. It will cause those symptoms and can "unstick" its self. Do a search on here and you find the info for about the valve and how to clean it.