1999 Chevy Blazer stalling

Engine Mechanical problem
1999 Chevy Blazer 6 cyl Four Wheel Drive Automatic 128xxx miles

bought car needed a trans. But would idle. Drove to trans shop and it overheated. And it would spit and sputter and sometimes pop in mid range. Got it home same problems. Found evidance water pump and a heater hose leak. Replaced all hoses and water pump. For milage and since I had it apart I decided to check the timing chain and it had some slop so I replaced it.
also replaced belt, plugs, wires, cap and button. Got it all back together and still had mid range issues but now it would stall after a few minutes og idling and would not start till hours later. It would try to but wouldn't. Then I notice more water leaking and found it leaking at the intake. Took it apart and replaced upper and lower intake gaskets and fuel pressure reg. Since it is in the upper intake. Now no longer have mid range issues but still stalls have replaced tps, tested ignition mod, fuel pressure is within specs, replaced pvc, vaccume lines, thermostat, temp sensor, fuel filter. Per advice of auto parts store I unplugged o2sensors and it wasn't running as rich but still stalled. Right before it stalls it sounds as if it starts drawing more air and it tries to keep itself running but to no avail. Not sure what to do next dont know if it is flooding itself out which I dont think so cause I pulled the plugs and there was no gas in them they looked wet but could not tell if it was gas or oil. Or could the cpi malfuctioning and how do you test it?