ok i have a 2000 deville that keep throwing p0300 codes i have replaced both coil packs and it still throws up p0300 what else can cause this its driveing me crazy

 

2000 caddy deville.... hey welcome to the Forum! sorry, can't help with your codes, however i'm sure the right Tech will respond soon.... look around the Forum, good bunch here to help, and have some good laughs...... get counted, off topic, Cadillac demographics- how old are we.... go to member intro so the Forum knows you better, and will help sooner. good luck and again welcome.....
rickyd

 

P0300 generic misfire. Scanner would be handy to monitor misfire counts. Without one Check spark plugs 1 should look different than the rest. Look at that cylinder. Bad injector, ecm, or plug.