Thought it was a good Idea to go ahead and replace plugs and wires but now I dont know so much. I have a 6.0 with 175,000 miles. About 2 months ago stopped by the NAPA store and got new plugs and wires. They gave me the Iridium pugs and Standard OEM wires. The Iridium Plugs I know needed to be gap at.40mm and we sat right there at the counter and checked everyone. I didnt have this code prior to installing the new plugs and wires. About a have a day later my wife told me that the service engine light went off and I drove it down to the Parts place and they told me it was a PO300 code Random Misfire. I should NOTE that the truck is running GREAT! Idle and hard acceleration. Can feel a mis or hisitation. This past weekend I spent a couple hours pulling out all the Plugs and wires and took everything down to the NAPA store were again we went over everything. Decided to upgrade the wires to the premium set. And I installed everthing once again. Truck runs Great. No codes for the first couple hours then without fail PO300 again, Thoughts?
Monday, July 2nd, 2012 AT 6:13 PM