Knocking, Rough Idle, and smoke

[Rebel]

Driving home to night and all was well till I came to a stop at a light. All of the sudden I notice the idle sucks the motor starts knocking and im smokeing like a train. Give it some pedal and the things smooth out a bit and she still runs okish. No check engine light. Think I lost and Injector again? any advice.

 

[Hot COCOAL]

Fill out your signature and user profile so we know what ya drive!

What color is the "smoke" comin out the tailpipe?

 

[Rebel]

Sorry been awhile since I've been here. Trucks an 01 LB7. Injectors were done about 80 or 90 thousand ago, head gaskets and studs about 50,000 or so ago. not sure on smoke color as it was dark last night. With the way its running i,m guessing an injector stuck open. Will a balance test show this? The work is no problem, I just don't have the tools to diagnose this.

 

[Rebel]

Smoke is black and smells like sulfer.

 

[Rebel]

Had it looked at, number 4 injector is stuck. I got it opened up today, Just gotta give Merchant a call now.