When I am sitting at an ATM or at a drive thru and let off the brake to move forward a little I am getting a vibration or something else going on. I am not giving it any gas just letting the idle pull the truck up a little bit. Is this normal or do I have a small vacuum leak only noticed when I am not giving it the gas?

 

happens to me too. hopefully nothing serious

 

I've got the same issue. Did either of you figure it out?

 

haynes manual tells how to check the iac. a dirty or malfunctioning iac causes rough idle.