HI

I have a 2003 Avalanche Z71. whats been happening is that when temps get cold ( 0 Celsius or lower)and when i go to start up the truck for the first of the day, it almost stalls then it revs back then almost stalls again..it does this until the engine starts to warm up and it will stabilize itself. the colder it gets (below minus 10 Celsius) it will stall unless i keep my foot on the gas pedal keep the rpm's up to about 2000. it doesn't do this when its warm outside. Any idea's or help would be greatly appreciated.

thanks in advance

 

i should also mention that there are no codes reported with this issue either

 

hard to say over the internet...could be as simple as an IAT or MAF sensor up to a vacuum leak

 

Thats my take.

 

thanks everybody. one question, i am trying to locate the IAT and i read the manual but the manual says its part of the MAF sensor. is this true? if not, where is located on the 5.3l engine?

thanks in advance