CHEVROLET BLAZER RADIO

When I Turn On Lights Radio Or Ac Or Just Idle It Will Jump Then Engine Turns Off

Light On Dash, Radio And Gauges Flicking On And Off As I Drive. Also Idle Seems To Be Really Low Once The Car Is In Gear And Not Moving.

I Was Installing A Aftermarket Jensen Head Unit And Then I Accendently Touched Two Two Wires Together And It Sparked Then After The Spark I...