Hello, 2007 Accent here: So when driving, my RPM and Speedo gauge go full tilt to the right and then full back to the left, and then come to rest somewhere around 40 mph. Also during this time the display for the mileage and what gear you are in flickers, as well as the parking brake light comes on and the check engine light, also during this time the cars runs rough and has a hesitation (this is all while driving and happens in about 40 seconds time). Then everything corrects itself and the car runs fine. There are no codes it is giving me. I cleaned all the ground wires from the PCM's to where they connect. Also cleaned the battery terminals and ground cable to where that connects as well. The battery itself is about 1 1/2 years old any help would be greatly appreciated in finding this Gremlin?