Hi %0AI have a Toyota allion ZZT 240%2C recently i have noticed that there was vibration in the engine%2C most recently i have replaced the Iridiyam spark plugs%2C front and back engine mount%2C throttle clean and injector clean%2C but still noticed that vibration is there.....

is any part of exhaust or engine in contact with chassis ?check for clearance !

Thank you, Yes i have checked it, but nothing like that, can you please explain bit more Thanks

front axel out of balance from worn joints maybe! tire tread rough! this only if while on the road!,

have you check whether any leaks on ventilation hoses at both ends, when it sucks outside air engine vibration comes in idling mode and consume more on fuel.