lost my cruise control and my air condition vent selector is stuck on defrost, if wait sometimes the vent comes on, but if i try the cruise it goes back to defrost.
the 4wd low works, could this be a vacuum pump issue?

 

i lost my cruise and my exhaust brake. It was all do to a tiny split in the vacuum line along the firewall/cowl. I replaced the piece of vacuum line and problem solved.

 

Yep, vacuum leak or pump.