JEEP CHEROKEE P CODES (POWERTRAIN)

The Trouble Code Reads P1391 And Reads Manufacturer Controlled Ignition Or Misfire. What Do I Replace To Correct This?

I Have Jeep Cherokee 2004 I Have Code P0300, P0304, P0305 What Could It Be Would Have To Buy A New Coil Or Something Else

96 Grand Cherokee, 4.0 These Codes Po351, Po108, Po443. Where Do I Start Can You Help Me?