my car idles normally but when I'm driving and come to a stop my car dies or it will idle really low for a sec then back up to normal. what could cause this?

 

check if you have a vaccume leak

 

Most common, mine on the other hand was due to bent valves, ran fine but always stalled at the light or when I put in neutral, and like yours idle was always up and down. Then finally blew the motor at the track and valves were bent even worse car would stay on

Soon the boost will be loose!!