So I have been having some problems where my 04 5.9L with 240k stalls out on me while driving. After trying just about everything under the sun, I noticed it will only happen if my key is in the ignition. If I start the truck, take it out while running, and drive off I’m fine. If I leave it in, I’ll die a mile down the road. Any ideas where I should start in terms of resolving this?