Cam/Crank Sensors

Ok, I know where the Crank sensor is, but I do not know where the cam sensor is. How hard are they to change?? Total cost for both of 'em is about $30, not sure which one might be bad, but was suggested to change 'em both....

The cam sensor is on the back of the cylinder head near the throttle body. To get to it you will have to remove the intake manifold. There is only a single bolt holding it in, but the intake has to come off to have room to get the part in and out. Sucks... It is easy to do, just a hassle to do the extra work.

Could that solve my problem as described in "Cough Grind Cough Clank Sputter"? People have suggested fuel filter, HEET (remove water from the gas), crank sensor and cam sensor......What order would you put these four things in??