My engine light came on and I took my car to autozone to test for the problem. I was told my camshaft losition sensor was out. Bought a new one, replaced it, engine light is still on and car kinda chugs when its idling. Is this a timing problem? Or something much worse? I did NOT reset my timing qhen I replaced the sensor. I'm due for emissions testing soon and need to fux this. Any help is greatly appreciated.