If cycling the key helps its likely you need a fuel pump. Need to test pressure at the injector rail. There is a check valve in the pump that prevents gas from backflowing into the tank when engine not running. Cycling the key activates the pump pushing fuel to the motor. The stalling could be inadequate fuel pressure under load. Thats why the pressure test is needed.
Seems like the fuel line looses its fuel or something. ????? That would cause a no start or hard start problem . Your best bet , have it diagnosed by a repair shop . That is unless you want 20 different answers on here . Are you willing to replace parts your vehicle doesn't need . Testing is the only way find the problem , not guessing , that's all you'll get on here . Hooking up a professional type scan tool an checking sensor data parameters to see what is a miss . Doing fuel pressure testing ,hooking up a pressure gauge .
007 Idle Speed Problems Scan Data for Idle
SOURCE: 2004 Chevy Colorado
i have a 2005 colorado it was in a accident the radio comes on but it does not pick up any chanel and thegas gauge does not work
SOURCE: Stalls when placed in reverse
well you have convertor lock prob prob a sensor for trans let me know hey till fix ya bouy me ok
SOURCE: The van has an issue with stalling. Have replaced
Try cleaning the throttle body. remove the big black air hose and with the engine OFF, hold the throttle open and see how the throttle plate is black. it should be a smooth transition. Carbon ring starves the engine for air at idle, especially when it is warm outside.
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