1995 Toyota Corolla Engine Cylender

I drive Toyoto corolla 1995. I have problem with engine light shows on. I went to michanic. He says my three cylinder are working good but one cylinder did not get spark. He tune up and change spark plug but still when I stop my car it gives too much vibration and when drive it feels like taking load. Now he says cylinder is not working so we need to change engine.
i am confused what to do? Anybody can guide me. I buy this car befour 2 years in $ 5000 and then after I change water pump, battary, all four tires. To much expensive and now battory. Please guide me what should I do?