i just got my b20/vtec swap in. it came with a chipped p28 and dont want to run and idle's really rough and wont rev without sputtering. i can plug my ecu that was running my d series and it idles up and down and can be driven but at low rpm's it cuts out. i pluged my friends 97 hx ecu in and it still idles up and down but runs alot better. any usefull help will be repped.