Help ... Urgent

I need help. I have a 1998 Hyundai Accent automatic, 4-door. The problem is that for several days now, the car has been having trouble accelerating from a standstill. I've changed the spark plugs, air filter, and fuel filter, and I even removed the catalytic converter because it was clogged, but the problem persists. When I start the car and try to accelerate, I have the same issue. I also changed the automatic transmission fluid, but nothing changed. When I'm driving, the transmission shifts fine; the problem is just the acceleration. I've already had it scanned, and it's not showing any codes, including the check engine light. What could it be? SOS, help please! Thanks

Does it tend to stall when accelerating? Does it run well if you accelerate hard?

It does not tend to pay, the problem solves it was the pulley where the alternator's girdle and the Cram sensor rest.