my 330i was rear ended (me stopped, other driver 40mph) with only bumper damage, but now is idling low, dies at stop lights, hesitates,etc. ???? why would this happen?

specifics:
2001 bmw 330i sport package, automatic, 107K mi

thanks!

ps will donate if another way except credit care or pay pal, have been ripped off in the past

you will need to hook up a scan tool to diagnose this issue.could be something to do with tank leakage managment( DMTL in BMW speak)