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Problem solved.

Just in case anyone comes looking in here for answers, 1 genuine OEM O2 sensor later and I'm back in business.

Thanks for the help.

Thank you. It's supposed to storm bad the next day or 2 but I'll check this out as soon as I can get to it.

So that leaves me with 2 questions: am I right in thinking this could be what's causing my lack of power, and do you have any ideas on what I can do about it?

I'm a good mechanic, not a good...

Here's the current tune

You're saying the wiring harness being oil soaked and shorting?

Any ideas on what may be causing that? I looked at the wiring just to make sure it wasn't melted on the header or something and it doesn't immediately look like anything is hurt.

L59 swap that has been running pretty well. ~280k miles on the engine, manual transmission. It sat for about a month over Christmas and I went to drive it today and it has no power at all under load...

Here's a screenshot of the log file as it stumbled and died. Several things happened but I don't know enough to know what is a cause and what is an effect.
125370

I have a DBC L59 from a 2002 Tahoe that I swapped into my '86 Blazer. I drove around on this engine for several months with no real issues before this problem started, but every time I start it I get...

That answers a lot of my questions. So I can't monitor what I was hoping to. I haven't hooked up to it since the last time it died, but that's my next move.

So my order of operation should be...

I've basically done nothing yet. After I confirmed it wasn't the fuel pressure I took a mental health break from the project to keep me from selling it, but now I'm back at it. I can get a light...

I have been having a recurring but intermittent issue with my L59 swap. I drove around on this swap for 6 months or so with no issues at all, but now it will randomly die and refuse to crank back...

This is my first LS swap, so I'm sure I've missed something. This is a L59 5.3L out of a 2002 Tahoe. I started the engine for the first time today and have 2 problems:

1) the MIL will not turn...

Summit won't return it?

Brian from SC. I'm in the process of dropping a L59 from a 2002 Tahoe into my 1986 K5 Blazer. I also have a 2014 Silverado.
Both bone stock motors for now, but the future may dictate cams and...