My 6.0 acts like the engine is ******* at idle and runs better with throttle, all gauges are good, no check engine light, both fuel filters are brand new. Will turn over without firing unless it has a little help of ether then fires away, as soon as you shut it off it won’t fire back up again, tried icp sensor trick doesn’t start any different. When you let off throttle and comes back down to idle it just about stalls then kicks back up