my 2002 toyota carmy v6 will turn over but after a few seconds it stalls. not drivabl
 

I was driving last night going about 80 km/h on cruise control.. i noticed my RPMs start to fluctuate. I felt the car shutter a bit (almost as if the engine hadnt warmed up enough and I started accelerating and let go of the gas while accelerating) so i pulled over onto the shoulder. I slowed right down and the RPMs continued to fluctuate so i put it into park. It then slowly went right down into the RPMs and then shut off. After this the engine will turn over but not stay on. The RPMs continue to go down and the engine shuts off after a few seconds. The check engine light comes on as well as the battery and check oil. Please any help would be appreciated or if anyone has had this happen to them.

Thank you!
Mandy