just changes the coil pack and spark plugs on a 2004 Saturn ion 2.2 for code p0301 and still getting a misfire on cylinder one and another code p0340 what can it be and where is the camshaft sensor located on this car

could be lots of things, from bad fuel injectors to blowing head gaskets. Cam sensor is on the head, go to an auto zone they can show you a picture and sell you one