Problem with 92 lumina 3.1 v6

OKay guys, it happend about 7 months ago just driving to get food, im driving down the road and the motor starts stalling, coming back on and off then, it shuts off, start back up runs good, the does the same thing. No engine codes, we replaced the ecm already, put some used coils on it ran a little better but i still dont know what is wrong with it. any help!

seems that it almost has a misfire, someone says the fuel injectors, other say the fuel pump. its got 140k miles i just dont want to put a thousands into it if itsa cheap fix.

That type of problem is tough to diagnose in the environment, could be crank sensor, Ign module, erratic fuel pressure. Check fuel pressure with a gage under load, make sure you have a recent fuel filter on it, after that it is somewhat experimental if it is erratic.

same, for me,, check and make shure all your spark plugs are firing.