2004 Malibu 3.5 V6 idle issues

so I did plugs and wires on this car last night. runs alot better but on start up, the car will rev up and then stall. This had been an on going problem BTW. Only way to get it to run is to give it a little gas on start and then it will idle fine. My mechanic buddy thought it might be a IAC issue but I guess this car doesnt have a IAC. With speaking with someone else, it looks like its could be a coolant temp sensor issue? anyone have/had a similar problem with this motor and knows the fix?