Well it sounds like my 3rd pair of cylinder heads is ticking. This is my second pair of Jan'05 heads in 6 months. I am hoping it is the lash adjusters. I am about ready to roll this bitch off a cliff. I am not sure what is causing all the problems with the heads. I sit in Los Angeles traffic and I am begining to think that is the major culprit. I would just ditch this car and get a C6Z but I have been through 4 cars in the time my wife has been through one , so she gets the next car. I can honestly say that the Cobra is the most unreliable car I have ever owned. More unreliable then the two 30+ year old VW bugs I had as a teenager.Un****ingbelievable