My truck will run fine unti it warms up. After it is warm it wont idle. It will rev up fine but when u let off the gas it wont idle. Anyone know what i should do. When it is doing this it sound like it is sucking way to much air or something. Thank you

 

You should clean your throttle body. If you think it sounds like it's sucking too much air, you might have an afm problem ( but I seriously doubt it). Poor idle can be attributed to every component associated with ignition, fuel delivery, and air intake. It's time for you to start narrowing it down.

 

check for a vacumn leak at one of the many vacumn lines