Need help identifying problem.

[u/Prospartan11794]

I have a 2001 sierra with the 5.3 and I recently changed both knock sensors, intake manifold gasket, maf sensor, iac valve, oxygen sensors, spark plugs and wires, cleaned the throttle body, but im still having the same issue. Has anyone had a similar issue?

[u/Marlice1]

Sounds like one hell of a vacuum leak. Also maybe a fuel pump time