2000 K2500 sputtering problem

[The_Viking]

2000 454. Just did tune up and all new exhaust manifolds back. Under acceleration it’s stutters after 60 mph. Used all ac delco parts for tune up. Is it a fuel issue? No check engine light.
Any help would be appreciated
Jim

 

[Schurkey]

What is the fuel pressure under load?

What is the cranking compression pressure of all eight cylinders?

What does the computer data stream tell you about misfires?

 

[The_Viking]

What is the fuel pressure under load?

What is the cranking compression pressure of all eight cylinders?

What does the computer data stream tell you about misfires?

I apologize I should have done more work before posting a question. It’s the knock sensors. I gotta figure how to change them.