my truck is an 05 f250. i never really had any issues with it then all of a sudden one day it just shuts off while im driving and wont turn on again. dealer says its ficm so they change it and give it back to me. since then i have had a few issues with it which are all sometimes it does this or that kind of things so of course the dealer cant find anything wrong with it and the service manager basically tells me im dreaming this stuff up. when i take off it sometimes will not rev up and has no power....kind of like bad turbo lag. the tach doesnt come off idle. it shuts off sometimes while driving and sometimes while at idle. of course it only does this while im on a busy road as luck would have it. when it shuts off it wont fire up again. today it started and then shut off and refused to start again. i turned the key to on pos to let glow plugs warm up and it started up again. also it has sometimes been stubborn to get started like in winter but we havent had a cold day yet. anyone know what this could be? my dealer is obviously of no help to me. thanks in advance.