Slow acceleration

[Sneek99]

For the past 3 months my 01 5.3 z71 tahoe has been slow to accelerate. I have no check engine light or codes that pop up and I have new ignition coils wires and spark plugs so I have no misfires. I'm thinking it might be a catalytic converter, or fuel injectors problem kan anyone help me?

 

[Scottydoggs]

if the engine sounds like a vacuum with your hand over the end when you floor it, id think cats are bad.

have you scanned it? might have a pending code stored, have to scan it running, after a drive, shutting it off can clear a pending code.

 

[Sneek99]

if the engine sounds like a vacuum with your hand over the end when you floor it, id think cats are bad.

have you scanned it? might have a pending code stored, have to scan it running, after a drive, shutting it off can clear a pending code.

Okay yea ill try scanning it after driving before I shut the car off