1996 silverado vortec running rough

[joker1s]

have a 96 350 vortec hesitating to take off from dead stop. I changed fuel filter, spark plugs, dist. cap and rotor, o2 sensor, plug wires, and intake gasket. What next?

[2000CAYukon]

Need to check fuel pressure:

Pressure with ignition on, engine off (with engine cold and with engine warm).
Pressure while starting
Pressure at idle
Pressure at 2000 RPMS
Watch pressure after shutting engine off. Pressure will drop but should not drop way off.

Post results when you have them.

//2000CAYukon

[joker1s]

is there supposed to be a vacuum line hooked up to the fuel pressure regulator? dont have access to a pressure gauge. there was no vacuum hose hooked up to the regulator when i took the old one off and im not sure if there was supposed to be one

[Jeremy-WI]

No vacuum hose, doesn't need one because its inside the intake

[mxmikie]

do a compression test (cyl 3/5) plug cat from leaking injectors