After motor swap have a rough running truck and issues...

[Languor]

Hey guys got a 2004 Silverado , my old motor seized from low oil pressure so got a replacement put in.  

 

Its running rough and gauges go funny at times and lights come on cluster and off randomly at times as well as doors sometime lock and unlock themselves while driving.  

 

It it is showing codes p0641 p0327 p0101 

 

this motor was running fine in the truck it was in before it was taken out and put in my truck. 

 

Have found clyinder 8 plug to be broke so I replaced that.  Possible the other plugs broke from the manifold when putting them on.  

 

My my questions is the engine codes.  What do I do?  And would a cracked plug cause these electric issues ?

 

it did have a p0300 code yesterday but after scanning it today it is gone.  Yet on real time data it does show a few cylinders missing (I will check the plugs tomorrow)

 

it it does have a little harder to start it it cranks fine but it takes a little longer to start

 

any help great appreciated im pulling my hair lol. 

 

 

[sefiroxx]

Chuck your ground points. Make sure any wiring is well seated (harness into ecu)

[Languor]

17 hours ago, sefiroxx said:

Chuck your ground points. Make sure any wiring is well seated (harness into ecu)

The negative battery cable.  The one end goes to the frame ?    It’s on the firewall bolt atm.  

[sefiroxx]

There should be one running from the engine block to either the firewall or fender.