My truck when first starting it revs to around 2500 rpms and then will drop to about 1200 rpms. The idle will jump from 1200 to 750 rpms until I give it some gas and then everthing will be fine. Any body have any ideas to what the problem might be.

 

May need a good throttle body and injector cleaning

 

I have a 2004 and mine did a very similar thing. It started all of a sudden, and did it for awhile. I took it in as it was under warranty and they said it was bad gas. I always fill up in the same place using chevron, so I didnt believe it. They drained the tank and cleaned it and it has ran great ever since. I hope this helps, I am glad it was nothing more serious, even though this was a hassle enough.

 

May be time to change the plugs buddy.

 

Change plugs, clean the TB, and get good gas. That should take care of it.