my is300 is shaking n wants to die when coming to a stop plz help on 2001 Lexus IS300

when i change my alternator my is300 started to shake n stutter when im coming to a stop and my check engine and trac light came on

by in Kannapolis, NC on January 27, 2013
1 answer
ANSWER by , January 27, 2013
what codes do you have?