I recently swapped in a 3.4l from a 95 Camaro in my 2.8l Bird. With the engine I installed new (rebuilt) Injectors meant for a 95 Camaro and a new 02 sensor. I used my dads OTC scanner on it while running it'll go in closed loop and run rich while driving. It I idle I get alittle black dust from the exhaust. Also, I get a rich code every once in a while, while idling and while moving.

Is there anything I could do to lean it out? I was thinking pushing the fuel regulater cap out so it gets less pressure. Will that help?

 

What's the fuel psi?