I let my friend drive home from track a few days ago. I was drunk so he drove back n close to city he says car runs weird. Car ran mint before we left! After he got out I drove home to notice a misfire n a clunk, clunk, clunk. Turns out my rear tires have drag (flat) spots in them. So thats the clunk clunk. I changed coils, plugs n wires to have car run similar. He says he passed cars only up to 160 kp/h. I had timing added n i think he rode KR out hard............number 1 n 4 were DONE!!!!! Missing electrodes n cyl 1 had chips in the porcelain. I dunno I have nothing but bad luck with this thing.........