The erratic idle is probably a loose or leaky vacuum line or there is a sensor bad, like the TPS or MAP sensor etc.
Most likely the speed sensor is on its way out.
The speed dialing option is not only good for its convenience on dialing numbers fast but if used the right way while driving; while at a light or a pause in traffic flow speed dialing can be utilized very effectively while driving.
Died while driving? Alternator
The gas mileage for the 2009 Toyota Tundra depends on whether you are driving in the city or on the highway. In city driving will get you 15mpg while Highway driving will get you 19mpg.
Check the fuel pump.
While driving toward the state line
Fuel pump failure, Timing belt failure,
maybe the clutch
Why does my car die out when I turn on a/c
causing a serious accident while driving
It is safer and improve handling while driving in higher speed.
when i am driving my toyato 2001 Eaco stops running, it will start back up