Truck stalls at idle.

[Cody McDonald]

I have a 99 GMC Sierra 2500hd with the 6.0l in it and here lately if the truck is at idle it’ll just cut off; no sputtering or anything it just shuts off. It will also try to stall out while going down the road if you let off the gas to coast down a couple mph it will try to stall when you give it the gas back. Any leads on what the problem may be will be greatly appreciated! Thanks all in advance!

[Supreme Pizza]

1 hour ago, Cody McDonald said:

I have a 99 GMC Sierra 2500hd with the 6.0l in it and here lately if the truck is at idle it’ll just cut off; no sputtering or anything it just shuts off. It will also try to stall out while going down the road if you let off the gas to coast down a couple mph it will try to stall when you give it the gas back. Any leads on what the problem may be will be greatly appreciated! Thanks all in advance!

 

 

 

Any check engine lights? And codes?

[asilverblazer]

Vacuum leak

Dirty throttle body

Sticking torque converter clutch

[Formulabruce]

My vote get some THROTTLE BODY Cleaner ( ONLY use specific Throttle body cleaner)

 pull off the air intake giant hose clamp, and hose, and clean, clean, clean, and back side of the throttle plate too.

All it takes is a Little dirt to cause this.