Sounds like the main electrical connector for the steering column is coming loose. Disconnect your battery, wait at least 10 minutes (for the caps in the airbag system to fully discharge), and get under there and check things out. Pull the connector(s) loose, blow them out with some compressed air, inspect them to see if there's some weird carbon build-up or corrosion, and plug it all back in. Reconnect your battery, and see what's up from there.
Another great source for information regarding your truck can be found
HEREHope that helps.