well today we put in the gt2-3cam with ls6 springs and everything went fine, up until i plug in the had held diagnostic, and showed a P0300, a random,multiple cyl, misfire, i havent yet retune, so i dont know if that would clear it up, this code never showed up before till now, any thoughts,

 

que onda wey if you put in a cam more then likely you have to retune. You're going to have missfire cause your timing is all off cause of the new cam.