Almost definitely the coolant temp sensor. When they fail they tell the PCM the ambient temp is about 300 below zero. This causes the PCM to run a very rich mixture, usually to the point the engine won't start/run. When you put the pedal to the floor, it goes into flooded mode, and cuts fuel spray to almost zero. You need the sensor on the intake near the thermostat.
1992 4.3 sierra wont start unless gas petal to the floor
what could be my issue? it only starts when i have the gas petal all the way to the floor.
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