My truck stalled again after changing the ops. I finally installed a new fsd onto a large heat sink under the front bumper. I've gone on a trip towing a boat through the desert. So far the truck has been running like a champ. I'm certain at this point my problem was a failing fsd. With the out of the engine compartment location, fsd stays cool at all times, never getting over what feels like about 85F to the touch after long drives.
Only time will tell but it's driving better than ever. No misses, surging or stalling since changing the fsd.