retired cop

Hello everyone. I don't post much but I do read a lot on this forum. I have a strange thing happen this morning. I have a 2004 c5 vette its stock only a CAI air filter. This morning I backed out the driveway the engine was cold. I shifted from reverse to drive. The trans acted like a manual trans would act if you tried to start in 3rd or 4th gear. The rpms dropped like a rock and the car almost stalled. I put it in neutral the back in drive and its been fine since. There was a vibration the happened as well. I am sure it was not the motor stalling any ideas??