03 PT cruiser gets a misfire on cyl1.It happens different times.Ran good wires IE Autolites and Autolite plugs.Tried Champion plugs NGK plugs and 2 more sets of wires.Always the same cyl 1 misfire sometimes.Had a carbon track on the plug that looked like a crack.I even use Mopar wires and changed 1 and 4 same thing wire or plug change.Not always but sometimes.Finally used a set of Advance House wires.Been on 2 yearsand so far so good.Still has the same plugs that I had a misfire on with hibuck wires.Rocky