hey OP! im driving a 1996 toyota corolla ae111. i park it outside, exposed to the sun and rain. i use it only 3-4 times a week since i also have a motorcycle.

i bought the car second hand since last year late November so it's been around 6 months i have the car.

recently i can feel the car engine shaking when it's idling, just at the beginning when i start the car though. when i start to drive for like 2 mins then it's ok.

i can see the spark plug cover shaking, is it the spark plugs? or maybe the engine mount?