95 rivierra problems

I have a 95 Buick Riviera S/C the other day I was driving and the low voltage light came on and then went off and a second later the check engine light came on and the speedometer jumped around then hit zero and I only have 2nd and 3rd gear now, the check engine light is still on and nothing...

Ok so i posted a thread on my car with no results. My supercharged 95 riv has.... uh lets say a few problems.It seems to be a solid car. 120k miles. Runs good. But it has random lights come on everyday. Airbag light, security light, low coolant light, and traction control light but my button is...