Hello family!! Well i have a 07 wrangler rubicon 4x4 and have a P0305 code. I have replaced the plugs and ignition coil. Immediately upon doing that my mpg began to do a countdown. It went as low as .8 mpg back to 30mpg and settled around 24. The check engine lighy is on now. Unsure how to fix this. Can someone please help me, this is first jeep and maybe my last if these are the issues I will have ro deal with. Only been jeep.owner few short months.