I keep getting a code when driving on the highway... I think it is p0302 off the top of my head. Whether or not I remembered the correct number, it is a code for cylinder number two misfire. So, I went through all the obvious maintenance: changed plugs, wires and rotor/distributor. The truck runs MUCH better, but I'm still getting the code while driving around 60-65mph on the highway. What am I missing?!?