So on my friends got a '00 s2k and he's been having from what it seems that notorious cylinder misfire I've read about. Well we've changed his plugs to ngk iridiums. Then went on the move and had his injectors sent out to be cleaned and rebuilt. Well now when he starts his car during cold start it gives him engine misfire. I've reset his codes after it that and when it warms up and it doesn't ever come on again until its cold. Anyone else have this problem and any solutions?

 

if you sure you don't have intake leak,try an induction service and check valve lash. might help , might not