wont start

every time is cold my truck wont start, battery is good alternator and starter just bought them, and still wont start, i was told is a sensor .it makes the noise that its starts and running well and then it just dies

every time is cold my truck wont start-Check if its fuel or spark problem -do below

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it