I have a 2000 Silverado 1500 with a lq4 swap and the last couple of days the truck doesn't want to stay idling when I first start it in the morning. It will start then if I'm not on the gas it will die. Even when I press the gas it won't rev for a couple of seconds then it will catch and rev. I have to keep the idle up till it gets worm then it's fine. Any ideas where I should start looking.

 

Has your VE and MAF been tuned for the swap? Its one of three things most likely, fuel, timing (not likely) or airflow. Without seeing the tune and a log its just guessing though.