Cam problem

ok i installed a Racer Walsh cam and it run really rough am i suppose to leave the timeing belt the way it was stock and what is the distrubitor suppose to be set at here the link to the cam thanks

Racer Walsh, Inc. 2.3L Camshaft #2 Hyd .454"

no that not what im talking about being rough i know the engine is going to be rough running at low rpms but the damn thing wont stay running worth a damn it dies out at stops after a few secs i adavaced the timing a bit to help keep it running a little longer but it hard driving threw traffic and having to restart your car at stop lights i dont understand why it keep dying out it runs perfect going down the highway