Why do I keep getting a traction control and a drivetrain alarm while driving?

Sometimes when I slow down and stop at a red light or stop sign these to alarms apear. The car goes into a throttle sensor lock that will not allow me to give accelerate. If I try to read the codes the thottle sensor alarm will only come up. If I turn the car off and then back on again the two alarms will dissapear and it will act normal. It seems to happen spurradicly. It will do it 3 times in 1 day and then not happen for a month. The car also idles up and down weird when this happens. Thanks guys