I drive an 02 Nissan Altima 163,000 miles. On Sunday i replaced the camshaft sensor on my Nissan and topped off the antifreeze in the clear container, i put some wetter wet into my radiator line and shut the hoood. Car started great Monday. Tuesday I was driving to work and it starts to over heat. I pull over and let it cool down but get back on the road. another 3 miles and it hits the very top notch of the temp guage and the check engine light goes on. it feels like a ton of bricks hit my car. it jerked back and felt..heavy..? So i got off the road and popped the hood. the radiator cap was off (oh ****, did i not put it back on?? had alll the antifreeze evaporated??) There was white smoke, or steam (???) it was dark. It smelled like maple syrup, sweet and sugary, was that from the wetter wet??? I poored some water into the radiator and the antifreeze and tried driving it around the parking lot. It was jerking BAD. the rpms were dancing. i mean just all over the place. it felt like a roller coaster going up the tracks. Finally my step dad picked me up and said to wait till after work. I got some antifreeze after work and filled it up, the radiator line and the anti freeze resovior (the plastic one). It drove fine but the check engine light was on. So i brought it to autozone, their code sadi it was camshaft (WTF??) and an engine speed sensor (TCM) I drove it home and it only jerked really bad whenever i applied the brake. i figured it would just wear off. it also had a problem accelerating, i would press it and it would barely hit 20 but the rpms would be at 3, like it was catching, finally it would get up to 40 or so. But thats scary when getting onto the highway. Then after i got home i let it idle in our driveway. the rpms danced between below zero and 1.5. I figured it would be a problem that would be fixed by just giving it sometime. About an hour later i came out to leave and the car started fine, better than it has in a long time. but it was shaking bad!!!! I pull out of the driveway and it dies at the bottom of the hill. i turn it back on, shakes and shivers and dies, again!!! So i get a ride, come back home. Starts horibllyyyyy!!! a long time to turnover. Havent driven it since. I have just replaced within the last 3 months battery (it died on me) spark plugs (cause you change those with the battery apparently) fuel pump (the mechanic thought thats why it wasnt starting good) cam shaft sensor (thats what autozone said) i do regulaur oil changes. i keep my car full of gas. Should i replace the camshaft again, it has a 2 year warranty? is it something more considering that my car overheated?