WHAT DOES 4AGE ENGINE SALE MEAN?

My 4age 20V is operating way also rich and gives black smoke in the exhaust. What i also observed is really a vibration at three/four throttle to WOT with about every single RPM. Doesn't sound flywheel relevant imo, when i had that issue on other cars and it sounded distinctive.Once i place them on the car I had to change my fuel reg to some coroll