Cuts out and rpm sticks @ 2500

What is your question?

02 esteem 1.8 litre cuts out randomly;does'nt quit but cuts out randomly;rpms stick @ 2500 to 3000 also random but only does it when cutting out; once in a great while will loose throttle control as in no acceleration; apply clutch and will respond; using clutch can also fix cutting out;replaced throttle sensor twice and cat. conv. once; still getting code for throttle sensor and cat. conv. Also getting cat1 code now. Acts up when hot and cold,no consistancy to problem. Hope you can help me. Have other questions but can wait for now.