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Fuel injectors ? Are there being commanded on by the PCM/ECM ? Do you know how to test fuel system , fuel pump relay etc... Fuel pressure test ! Follow this guy's testing procedure ! GM Fuel Pump Relay Testing If you can't your best bet is take to the dealer !
Check the battery connections for "crud" and clean them if necessary. Also, if you're still running the original battery, it's likely time for a replacement. Three years is normal for an OE battery, four is great, five is fantastic, and you're at nearly six years . . .
You should have a air temperature switch in the air intake which sends the intake air temperature to the computer which in turn adjust the amount of fuel the injectors inject. When the air is cold, the computer allows more fuel to act like the old choke and the motor idles quicker. If the sensor is bad, then the computer would not speed the engine up.