1995 Vert z28, Pacesetter headers, no cats to open Midpipe until I get my new flowmasters installed on Monday, Manual Swapped, No AC, Cold air intake, brand new cardone optispark, plug wires, O2 sensors have <1000 miles, new coil, new icm

Since I bought my car back on Halloween 22' it has had a misfire, I have replaced the above parts but nothing as caused it to go away, I finally got a cable and can start analyzing what is really going on with my engine.

 

I am no expert on reading logs, but the only things that looks funky is your target idle speed at the beginning, and your tps volt is 3.82 to 4.39 at 100% throttle. I'm not sure if it matters, but my voltage at 100% is 3.78, this varies with what I've seen from others. A wideband reading would be helpful in reading these logs as well so we can see your afr. Do you have catalytic converters? Your bank 1 and 2 look pretty different in many places, not sure what that means, but mine are typically very similar.

A couple of things that can cause a misfire:
Improper plug gap
Plug wires crossed (I've accidentally put 5 on 7 and vice versa, check that)
vacuum leak.

Start with getting a vacuum gauge on there to ensure theres not a leak, check plug gap and that wires are not burnt and on the proper plug. I would also do a compression check to ensure good compression on all cylinders.

I have also seen valve lash cause backfiring (not necessarily a misfire), so if you get through all of the above, check the lash/valvetrain as well.

 

No catalytic converters, I’ve pulled all of the plugs out and gapped them all to .050 not too long ago. No plug wires are crossed. I will try and check vacuum. How do I do a wideband scan?

 

Buy a wideband o2 kit. it will come with a gauge and wideband o2 sensor. You will have to weld in an o2 bung and run it to the gauge. Wire the gauge to your PCM or use the ac switch (google how), and when you scan, you will be able to calculate your AFR.

Have you verified fuel pressure and that your injectors are firing?

 

Here’s a little update, The car just started making this noise today.

 

that is a rod knock. You need to not run the engine anymore and rebuild it.