1999 Saturn SC 78k miles shuts completely off, then back on

Hey there.
I have a Saturn SC 1999 with 78k miles on it. It has two problems:

1.) When it starts cold, it had a loud sound that countinues sporadically until it warms up. It sounds kind of like - 'VrrrEEEnnnEEnnnnEEnnnEE' (makes it sound like a toy car) and occurs as soon as the car is moving, most noticably when pressing on the gas but also occurs when its just coasting. It has recently gotten worse.

2.) The other day it died for a second then came right back on. The radio went off, all of the dials flickered down, and the fuel light went on (despite it having plenty of fuel, ) and then it all came right back on and the airbag light flashed. It did this 3 times before I got it home (in the span of 2 miles) and was hot off the highway. Its not a loose battery terminal or a blown fuse. Please help :(

Thanks - L