Q: Every warning light on dash is on. on 1996 Pontiac Grand Am

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
warning lights comes on car will not start.When lights goes out car starts every time. Sometime when driving the light will come on but car keeps running but when i shut it off it will no start. If light is on and I hit a bump in the road the lights goes out and the tach works.
(1) Answer
I'm assuming you're talking about the check engine light.
The check engine light indicates that the computer has detected a malfunction in the engine/emission control system and has diagnostic codes and data stored which would be essential in diagnosing the problem.
A technician with a scanner could access the diagnostic codes and data and then be able to give you a diagnosis.
If it's the other warning lights, there must be an electrical problem, the fact that hitting a bump affects the engine points to a bad electrical connection somewhere.
If you want to find a GM specialist, here's our directory link for you: