How to disconnect wiring harness at firewall

[hsi111]

Hi in there. I just bought a nice 1997 tahoe 4x4 350 with a blown head gasket. I am tackling the job myself and have disconnected everything on the motor with no problem. Then came what should have been the easiest part; the harness to firewall. I have spread the two plastic clips and beat on the plug (down) for an hour and it won't budge. Am I missing something here or is it just stuck? Thanks

 

[SunlitComet]

Even if you pull the engine you should pull the wiring harness off engine components. You have to do it that way any way.and there are at least 2 connections that can get crossed if not paying attention. No point in doing work not required. BTW get your hands on a scanner cuase you will need it to fine realign the distributor to prevent error codes or misfiring.

I am actually starting on mine this week.

Here is a six part video from youtube that will help walk you thru it . Just keep in mind that tecnically the 350 does not have to have the upper plenum removed first. I twill come out as one unit. If you do however still have the original injection spider system in the motor REPLACE IT NOW.

http://www.youtube.com/watch?v=ysnxBbdtu84

 

[retorq]

Why do you need to disconnect the harness to the firewall for a head swap??