Engine subtle vibration / shaking tail tail sign of near clog catalytic converter

Engine subtle vibration until the dashboard area but there are no error fault codes when diagnose using the OBD2 scanner device. What could be the problem? This is happening to Alza car and the vibration still ongoing for quite sometimes. 

Apart from the vibration when the engine starting at cold start (early morning) strong smell like rotten egg emanating from the exhaust and of course the car unable to accelerate at full speed on the road despite pressing the gas pedal at full throttle. This is because the clogged catalytic converter suffocating the engine from breathing normally.

OBD2 fuel trim data also showing very rich exceeding the benchmark below -10% | +10% and it may spike up to -40% which is extremely rich or +20% for extremely lean. This is a sign the unburn gas during cold start unable to fully escape through the exhaust manifold catalytic converter and generating kick back which affect the oxygen sensor reading. So basically, exhaust fume generated from the combustions plus the kick back of unburn fumes caused the oxygen sensor to read extremely rich. However, pressing the gas pedal during cold start will see the fuel trim reading back to normal within -10% to +10% benchmark as the unburn fume being force through the clogged intake manifold.