Cpk Symptoms?

throwing the codes for bad cpk sensor but does anyone know what are the symptoms? mine barely idles and you can't give if any gas. also has a bad back fire(probably exagerrated by open hooker LT's)
thanks

When I was getting the code my car idled weird and was down on power. I replaced the sensor and got the same code again:confused: I still get it from time to time, I think it might be related to the cam??