I got a 2000 Lexus rx300 with 200,500 miles and it’s doing this weird thing we’re if I accelerate lightly after Turning it on or shifting into first gear it will kinda stall or freeze and then it would just release and shift normally. But when I accelerate with more force it won’t do that but shift a little hard on first gear or sometimes it just shifts smoothly. It mostly happens when I accelerate lightly into first gear or if I I’m accelerating and then brake and then accelerate again. I know it’s complicated and I apologize but that’s the best I can really explain it does anyone know what it could be? I changed the trans fluid around 198,000 and put Lucas transmission fix in it as well.