So when I turn on my car it idles really rough but when its above 1500 rpm it sounds fine. I pulled code p0021 and it said it was the intake camshaft position sensor. I bought one from autozone and I cleared the code but still no change the code keeps coming back. Any idea what it can be? Please help!!!!

 

Need more information to opine. Have you done anything to the car? Mods? Year?

Sounding like you need a trip to a garage.

 

It's already telling you whats wrong clearing the code won't make it go away. Take it to your dealer.