The truck runs and idles good but sometimes it will occssionaly drop down to 100rpm, anyone have this issue before?

 

When exactly does it drop down that low? (Braking, accelerating, turning)

 

Mine does too. Drops to around 100 at idle. Been doing that about a year. I'm pretty sure it requires replacing the cluster. I'm not interested in spending $800 for that. Tach works fine otherwise. It's just at idle.

 

Yup, its the cluster.

It seems to be only an 06 thing. I've tried removing my cluster and re-flowing some solder as others have suggested but it didn't fix it for very long.

 

It help when sitting at a red light, it so when i start braking and coming to a red light it will go to normal idle and then a few seconds later while im still at the red light, it will drop to 400rpm and then go to 100rpm until obviously it turns green and I start moving again, then its all back to normal

 

Just the tach or the actual rpm of the engine?

 

just the tach

 

so what does it matter then? I wouldn't concern myself if it isn't affecting the performance of the truck.

 

It is either the cluster or PCM in that case I would think. I would guess cluster.