Hello I'm new here and I'm having a problem with my 300 my Check engine light comes on and gives me codes P0300 and P0301. When the light comes on I get bad gas milage, if I unplug the battery or pull #11fuse the car runs fine then like 4-5 days later i can be at a light and the car starts to go forward with my foot on the brake at that point I can tell that the light is going to come on. I have changed the plugs with the factory ones and changed the coil for number one and the injector . I'm lost I love my 300 but I can't get to the root of the problem........Please help me the dealership can't they said that ECU is throwing a code P1004 and I need the replace the plenum then can check out the misfire codes

 

P1004 Chrysler Short Runner Valve Control Performance OBDII Engine Light Trouble Code | Engine-Codes.com

 

I have gotten that code once but I the misfire codes more

 

Check the metal egr pipe at the back of the plenum for leaks that happened to mine just a small leak but it caused so many false codes hope that helps