check battery connections,,both ends...may b key switch...for radio noise check cap/rotor is equiped...new ones fixed my radio noise....2 yrs ago i traded in a 97 saturn cause it was cutting out for just a secound 2/3 times a week...but usually while my wife was going to work over big mountain...no power steering on curves...scared crap out of her..a bad coil can cut out like that but sooo many wires in newer cars.gd luk