what is evaporative emission system vent valveRelated QuestionsChevy Impala 2010no A\/C. ice possible. drive safe. what's wrong? how can I fix this?04 Chevy ImpalaWont move in any gear. You can hear the gears shifting but wont move when the accelerator is pressed2003 chevy impalaWe have put in New alternator,battery and starter but yet it won't start. Lights,radio come on, we will turn the key to start it but nothing. What could it be?