When we first heard this LB7 idle into Flynn's Shop, we thought something was coming apart inside it...

 But after killing the troublesome cylinder with a scan tool, and the truck's idle immediately smoothing out, we knew it was injector related. The result? A cracked nozzle.While injector failure is common on LB7 Duramax mills, we didn't think cracked nozzles were. Driven much longer and this customer would've had a washed out cylinder, cracked or melted piston, or worse.

 Check out the video here