So I'll try to be as descriptive but stay on topic with this I just finished my LS swap got my exhaust put on and went to drive home the car today the car is a 1989 Chevy suburban the ls is out of a 2005 Chevy Silverado

Everything is stock as I'm going for a smog compliance swap I'm trying very hard at this to get everything right and this is where I stand

As I was driving home from the exhaust shop this is the first time I have driven it the truck shut off and all the electricals were flickering consistently within second intervals the electronics on my dash and I can hear the relays clicking as well as the throttle body clicking any electrical device on the car whether it be the starter windows or windshield wipers would twitch on and off with the electronics

I turned off the car for maybe 10 seconds and the clicking went away and I was able to restart the truck I got gas got on the freeway and then maybe 10 miles down the road after giving it a little more throttle it repeated the same thing shut off everything twitched I had to pull over put it in park wait restart it and get back on the road it is not just a matter of turning the key off and on as I've done that and twitching was continuing it only seems to go away after I have the key off for more than 10 seconds

this happened a matter of four more times on the 40 mile drive home and continues to do so now



The only thing that I have not done is plug in the O2 sensors as I just got it from the exhaust shop but I failed to see how that would cause all the electricals to shut off the entire car

I did take a short video of exactly what it's doing which can be found here

~~~> https://drive.google.com/file/d/1j7SLTA-bCUD3Z68BSxEr1RlbXG8fUjbE/view?usp=drivesdk

Any help would be greatly appreciated as I'm questioning what has gone wrong I can't tell and I feel like the trans is slipping but I don't know if it's in a limpo mode and not letting it rev or go pasta. Certain rpm

 

it sounds like your main power supply for the truck is loose or something. Maybe at a battery junction block somewhere. Or maybe your ignition switch isn't real good. Do you have an ignition relay powering the LS harness or are you running everything through the factory ignition switch on the column?

 

I'm running everything to a factory column I can try to replace the Ignition switch but I've already done that not maybe 10000 miles ago when I had it apart to fix the wobble in the steering column

Everything else that I have running to power stays on except for the Ignition to the engine itself that keeps flickering on and off

I followed the wiring diagram and video tutorials of LT1 swap.com

The 1st time the issue occurred little throttle and it almost immediately cut out going to the gas station turned it off started backup no wires appeared to be loose I couldn't find any issues