Newbie needs help,my Duster won't start

thanks everyone. I gave up and called in some help. he hauled it to his garage and after tinkering awhile he went to try and start it and it fired right up. however as soon as he left off the key it shut off. he tried again then it fired and stayed running as long as he held the key still. as soon as he moved the key it shut down. so we ordered a igniton switch and the tumblers. hoping this solves my problems. thanks again