This will sound stupid but give it a try if nothing else works. Switch the o2 sensors if it is a b16a1 motor with two sensors. I've done this several times on a1 motors that are stuttering and it fixed it every time.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.