same thing happened to me! took it in 3 times for it and couldnt find it. On the 3rd time they tore down the engine and the machine shop said ALL the valves were bent. they blamed it on me and i had to pay half to get it fixed. a little over $1000. They said i over reved which never ever happend. They didnt even have a over rev code stored!! needless to say lemon law helped me out by getting my money back
