Issue with fuel cut, backfiring, and rev limit at ~4k

[itgoes]

I have a 92 MR2 with a K24 I just picked up and am working through. It came with a dyno tune. It had a high idle ~2.5k, but ran well out to the 7600 rpm redline otherwise.
I adjusted the throttle body screw so that the valve gets as close to closed as possible without sticking. Maybe a 2 degree adjustment. It has an IACV. Now it idles nicely at 1k rpm. I calibrated the TPS in software.
Now it backfires and rev limits at ~4000-4500 rpm and MIL flashes.

Asking for help because I am seeing some things in the log that I don't quite understand. I attached 2 snippets from a 45 minute drive
In the "Rev limit and sensor cutout" log, VSS, AF and Gear all go to incorrect values as it stutters and backfires. Then rev limit comes on after I have let off throttle.

In the no sensor drop log, rev limit comes on after a weird TPS drop and blip. I did not feel this happening at all in the car.
Then I slowly rev up to 4500 rpm and get some more backfires and release throttle to 0 and then rev limit comes on.

Could this be caused by bad TPS? It is an Acuity unit I have had on for less than 100 miles.
If it is from the throttle body adjustment, what should I adjust? I am not seeing anything obviously off.

Thanks for the help


Logs and calibration attached


SN: 59817
Kmanager 4.5.6
Type S ECU
RBC, Skunk2 70mm TB, Type S oil pump

[Spunkster]

Have you tried the ECU on a known working vehicle using the calibration for that vehicle?

[itgoes]

Unfortunately, I don't have access to any other cars to try it on

[MondeCruel]

You dont have knock sensor ?

[itgoes]

Just posting an update in case it helps anyone else in the future. After doing more shakedown runs/tests and getting a better idea of what was happening, I had very similar symptoms to this thread here:
viewtopic.php?t=22269

Fuel pump would cut out and I assume main relay as well. Car would buck and stutter and backfire at any non specific RPMs after VTEC had kicked in. After the first stutter, it could happen at any RPM and would get into stuttering loops.

It turned out to be a bad ECU ground on the cylinder head. Wires had been broken internally but maintained continuity and would only disconnect under certain vibration frequencies for a brief moment. This did not show up doing normal ground tests. I hooked up an oscilloscope and caught the voltage between the KPro VS and ground pins dropping to 7 volts when the fuel cut even though battery voltage was fine and tracked it backward from there.