I have an 05 jeep w/a 5.7 eng. Problem began with the engine RPMs jumping from 600 to 1200 while idling. I replaced the EGR and it did not correct the problem. I recalibrated the gas pedal with no improvement and now the ETC idiot light is on and the throttle doesn't work at all. I disconnected the battery for 30 min. and then started the engine, the ETC light was off, the throttle control was working for about 10 seconds and then quit. The engine is at 1200 RPM and running rough and the ETC light is back on. Looking for suggestions on what to try next.