Car keeps dying when driving?

I have a 1997 Honda Prelude. After a few blocks of driving the car suddenly loses power and dies and the rpm drops. It happens after a few blocks of driving or when I launch and downshift. I check oil, it's fine. No check engine light, the last time it was a knock sensor and I replaced it and light went away. But it still drives horrible. It seems stuck or something. I took it to a mechanic and he couldn't find the problem. I'm stuck on this for weeks now

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