A couple weeks ago I put new plugs and wires on my 2000 SE 3.1 and started getting a 300 code random mis firing. Started taking the wires off to see if maybe I had some fowled plugs and the ends of 3 of them stayed on the plug. Paid $54 for the set because I wanted some good heavy duty wires. Taking them back shortly and see if new wires work. This is why it was running great one minute and sucky the next.