Alright, so I just had my timing belt and water pump replaced, and everything was great. I changed my oil, still everything great. I bought spark plugs, and I had them put in. I didn't have a torque wrench, but my uncle says he'd put them in, no problem. So he puts them in, but after a while of driving, it started sputtering. It felt like my car was about to stall, and I don't know whats up! We took the spark plugs out, and he put them back in, and the problem only got worse, and my check engine light came on. It does it when the car is cold, but after it warms up, it seems to stop. The idle is VERY rough, it is almost stalling, it seems. Any ideas, anyone?