DanTheMan97
Member
I've got a 2005 Expedition XLT V8 5.4L with around 132,000 miles. I had a studder issue and code P0302 showed up. Long story short, I ended up spending $400 to have a shop replace all 8 plugs and the issue had appeared to be solved for the last 5,800 miles. Yesterday while being stuck behind a slow person I noticed the issue again slightly. Was driving about 45mph at the time. Now today while driving I noticed it being very sluggish. After purposely pushing the gas pedal hard, but not to the floor, I got code P0306 to show on my code reader. Does anyone have some suggestions? I'm thinking either defective plug/s, a coil pack or possibly even the catalytic converter needs to be replaced. Don't want to throw a $50 coil pack in just to find out thats not the issue.