This started a week after a timing belt/water pump change. I dont think the belt sliped because it feels good when its warm, no problems. I was thinking maybe theres an iar pocket in the coolant causing the iac or iat (forgot acronyms ) to not give it more air when its cold. ITs not my car, i told the guy to check the idle tomorow morning when its cold. So the quesiton is, would this be causeing it to stall? Its an auto and in the morning when its cold u put it in drive take your foot off the break, start hiting the gas and it stalls. Any ideas?