ok so I got a 04 chevy impala ls a couple months ago and today as I got home from school I locked my car then for some unknown reason i unlocked it, locked it again then pressed the trunk button twice to get my backpack and out of no where my car starts. I had to get in my car and press my brake to stop it. I have tried numerious time to repeat this procedure but it isnt working. Can anyone tell me how to remote start my car? All i have is a unlock, lock, trunk and alarm buttons.