PONTIAC BONNEVILLE SHAKE

I Think I May Know The Answer To This, But Can You Tell Me Why My Car Shakes When Braking. Thank You

While Driving Badly Engine Light Flashes And Stays Auto Track And Abs Goes Off When Hitting The Smallest Of Bumps Get In Car Turn It On It...

My Car Has Been Shaking On And Off For About A Month And Now Its Worse. While Driving It Doesn't Want To Excelerate Properly And The Speed...