The computer fuel injection uses a lot of the carb fundamentals. The coolant sensor is the choke and as the temp is colder the injector on time is lengthen. On vehicles with the original GM throttle body [two injectors] the computer pulse both injectors at the same time during cranking. the pulse is alternating during normal engine load and then when accelerating the injectors are pulsed together. This is like the back 2 barrels opening. The reason you push the pedal to wide open after trying to start, is throttle position sensor tells the computer to go lean [clear flood mode] in order to clear out the excess fuel that did not vaporize. The fuel may have been to cold to fully vaporize. I hope this helps some as the my information is from the GM before it become Govt Motors. I was a contract instructor for close to 25 years.
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