hi guys, code 43 on my b16a2 delsol. fuel supply system.

what parts do i need to check and how to find out what part is faulty ?
i brought some injectour cleaner just to see if that would work incase i had a bad injectour but it still remains on. also i have re-set the ecu just to double check and it comes on after about 4 miles.

the car as soon as you come off the gas drops its revs to about 200rpm for a second then it jumps back up to 700rpm. after an ecu re-set it idles constantly at 700rpm no problems until the cel comes on. i can still get vtec with the cel, and the o2 sensor was changed out 6 weeks ago as i had then codes for o2 and fuel supply, which on fitting the o2 removed both cel codes!

help