Hello, my van keeps shutting off about 5 minutes into driving.

check your o2 sensor or better yet go to an advance auto or auto zone they can check for error codes and if there is one or more you can referce it with any reputable kia dealership

don't gues it gets costly seek diag and est

review when last tuned . it may be due. rec. every 50,000 miles. rec. fuel system clean. ethanol treatment to 1 tank of premium. ethanol blend in in fuel cause build up in fuel system, combustion chambers, exhaust and causes increased wear to spark plugs. a clean fuel system always runs better. result takes some drive time so be patient. bring to a shop for diagnostic run to find any issues u need to be aware of.