95 one ton stalling???

[tbioneton]

i recently replaced my engine in my 95 one ton. it will start and run just fine. when it warms up i cannot keep it running. it will start however when i put it in gear and or put the gas down it stalls. the only way i can keep it running is if i dont touch anything and just let it idle or i have to put the gas all the way to the floor. any less than the floor it stalls. no vac sys leaks. could it be the timing, oil pressure cut off, o2????

matt

[2COR517]

You should start by checking for codes. Seems it's a temperature sensitive issue, I would start with the coolant temp sensor.