I have already emailed Mark but I was hoping one of you guys could help me quicker. I went to install Marks chip and remove a Turner chip. Everything went good but with Marks chip the car wouldnt crank. I turned the chip around and still no ignition. So I reinstalled the Turner chip and the car fired right up. I want to try Marks chip because I have heard from you guys it is the bomb. Please help if this has happened to you please let me know what to do.