When ya romp on the engine, going up a hill or speeding up quickly, the blower changes from the dash vents to the defrost, then when the rpms drop it goes back to normal. The 4 wheel drive seems to work, and the transfer case shifts fine. The engine seems to load up and stall if ya hit on the breaks hard as in a sudden stop but it also hasent been driven much in last 6 months. Im not sure but it seems like a vacume leak issue. It has 225k on it. Any ideas would be helpfull. The headlight switch will need replacing ( should fix it lol ) but really thease seem to be the only issues with the truck i need fixed right away

 

Put a one way valve on the vacume hose....sorta like the ones for fish tanks so the air only goes one way try that

 

Ill do that. Im going to look it over pretty well soon as i can. Fire department has kept me pretty busy with the ice we have had lately. Been quite a few wrecks lol

 

The system should have a vacume check (one way) valve.
It's designed to keep vacume to the system on hard accelleration.
Without vacume the mode door defaults to the defrost position.
The vacume line/tube/hose usually comes out of the firewall throught
the opening for the A/C Expansion Valve/Block (H Valve).

 

You have "wild vents", do a search in the 2nd gen Ram section for that. Plenty of info out there. A common problem. Welcome to DF!