i have an obd1 b20b and yea it runs lean. thought about swaping it to obd2 didnt know if any one has done this before. would it be better to chip or swap. car is stock and wont have any mods for a while. its an every day car would the mpg be better or worst that kinda thin. thanmks for help

 

I strongly doubt its leak cause of it being on an obd1 ecu.

Why do you say its running "lean"