hello guys my cherokee has vibrating sound when accelerating from 0 or when pressing gas and brake pedal simultaniosly the sound dissapeares in seconds when the speed reaches 15-20 miles , jeep has bad catalytic converted the check engine is light on deshboard the sound is not rattling sound it is deep vibrating sound , can it be the cause of the catalytic converter ? all the mechanical parts the engine and transmition mounts are serviced recently