Got a 95 chevy 1500 5.7 that will run perfect with advance timing unhooked but dies out when it is hooked up. Not a problem it's always had but it is now since I replaced distributor. I'm being told possibly knock sensor?

 

If it didn’t die before the replacement, the most likely cause is the new distributor.

That could mean there’s a problem with the part (faulty or incorrect for the application) or something went wrong with the installation.

First verify the replacement distributor is the correct one; then verify the installation is correct. I’ve removed and/or replaced dozens of these distributors and it’s not difficult to misalign the teeth even when you’re being careful.

You should also check for DTC’s even if the SES light isn’t on.

FYI it’s highly unlikely a knock sensor will cause the engine to die. The ECM uses the knock sensor signal to retard ignition timing and prevent detonation (spark knock). For the most part it’s only utilized during acceleration and high engine speeds/loads when the ECM is advancing the timing.

On the off chance that it is the cause, the simplest way to confirm is to unplug it and see how the engine responds.