Hello, 

06 Corolla 225k, my relative filled up gasoline at the gas station and when she drove off from gas station noticed that car started to shake a little and vibrate, after two days the engine shake and vibration got worst, and and feels like the engine is about to die. Contacted Fred Meyer gas station and they denied that it’s a bad gasoline and was told no customers complained about gasoline. 
pulled out ignition coils and noticed oil all over them and all over spark plugs, replaced valve gasket and pcv hose and pcv, and replaced all spark plugs, same issues no improvement, the engine shakes and feels like the engine is about to stall when at idle, and when driving, and no matter what gear you’re in even when in park and reverse same issues, besides when in neutral it feels like it’s normal, please help with any advices or suggestions, my relative is low on budget and can not afford to put any more money into this car. Thanks.