I have a 91 crx si with a B16a swap (2 weeks old). the car used to have a supercharged B20 vtec in it but i spun a couple of rod bearings. I took the car to my local race shop and had them put in a jdm b16a2 when the swap was done i threw a check engine light for my primary O2. the car ran rich for a couple of days then started to lean out to a good mixture. now the car will run normal after starting but lean out after a few minutes of driving. It starts to back fire horribly and has NO power at all not even enough to keep me at speed. i need help.
Full mod list :
Jdm b16a2
p30 ecu (virgin)
ebay header (came with the car not my choice)
cat back 2.25 inch
hac throttle body (also came with car pretty sure it is a stock bore)
short ram intake with specter filter
walbro 255 fuel pump
an fuel lines from earls
Golden eagle pro fuel rail
ngk 5 wire o2 with wideband in car


any help or advice would be much appreciated