Limp Home Mode

[agloy63]

I suddenly have an issue where at random times my engine will go into limp home mode. This can be cleared by shutting down the engine for a couple of minutes, or by using my OBD WiFi connection and an app on my iPad to clear the code as I'm still driving.

The codes I'm seeing are:
P0068 MAP/MAF - Throttle Position Correlation
P0221 Throttle/Pedal Position Sensor/Switch B Circuit Range/Performance

Any advise would certainly be appreciated.