Hey all I swapped in a b18b1 into my 98 civic hx 5 speed I am running my hx harness and if I try to run any ls ecu it won't run right it seems like the engines being constricted until 4500 - 5k and up it pulls hard I sold my hx ecu right when I got the swap so I never tried my hx ecu. I've tried running 3 different ls ecus and they all dob the same thing. I'm running a obd2 civic cx ecu right now and it runs and idles good just a little low on the idle and has issues when starting cold

Any ideas?