I have a 04 xt 5speed and was driving it when it started lagging a little bit then a minute later it started throwing a check engine light... a few minutes later it starts misfiring real bad so i get to my buddy's house (5 minutes later) and the turbos BRIGHT RED and so is the down pipe.,, my friend had a computer and it showed the 4th cylinder is misfiring... how hard is it to change the plugs and wires (assuming thats what it is)