Random stuttering and stalling

[immacomputer]

Hi, going to try this again. My '95, stock KA24DE, 240 has been pissing me off for over 6 months now with this lagging hesitation stuttering bullshit. Sometimes the car runs perfectly normal with no back firing or issues and then randomly while driving, it will start to stutter with constant throttle. When its in this mode, it will stall if I put in the clutch. If I keep it in gear and slow down, it will backfire extremely loudly at 2k and 1k rpm. It never backfires when running normally.

It's not throwing any codes anymore and I've replaced the distributor, O2 sensor, IATS, MAFS wiring, coolant temp sensor, spark plugs, cam position sensor, knock sensor, and timing chain. What could be causing this??? It's driving me crazy... I want to sell the damn thing but it probably needs to be running consistently to get any money out of it.

Any help would be greatly appreciated. I'm hoping it's not wiring issues but I'm out of ideas and my mechanic friends are also stumped and pissed off as it's making them feel stupid.