Car quit. error P0341 "faulty CMP sensor". Got used distributor/sensor and go to take out existing distributor. Mark existing distributor and try to take out, but is will not come out. Distributor housing will rotate, but distributor shaft will not rotate. Can wiggle shaft very little, like something is holding the bottom. So I decide I will rotate engine to try and free if in a bind. Does not make any difference and I see that rotor is not turning when engine rotates. Existing distributor still stuck and distributor shaft will not turn right or left. Do you think it is a broken camshaft, timing chain or something else?