hello all. okay heres what i have. i have a 96 deville and i keep getting a service engine soon light and once in a while the rpms drop below 500 occasilly stalling out. i got a message on the display that said cheak emmisions system. now i dont get that message any more but i pulled the codes and i havent been abel to find out anywhere what my code mean. here is the one that is current and if anyone can help me with this one i wil;l list the ones in the history. here it is PZ2719 current. and can anyone tell me why when it goes trhough all of the codes it says PCM? okay thanks to anyone who can help.