2006 DODGE CHARGER 2.7 L hard to get it running code P0016

ENGINE WAS REPLACED TWICE AT ANOTHER LOCATION WHILE CRANKING FOR 6 OR 8 SECONDS ENGINE WILL START CODE FOR CAMSHAFT CORRELATION WILL PUP UP I HAD BELIEVED THE CAMSHAFT SPROCKET WAS WRONG KNOWING THERE IS TWO OR TREE DIFFERENT GEAR SENSOR RELUCTOR TYPES I DID TRIED THE SPROCKET ON THE LEFT CAMSHAFT SPROCKET ONE OF THE TROUBLE CODES WHEN AWAY BUT STILL HARD TO GET IT TO START AND CODE P0016 STILL THERE MAY QUESTION IS DID THEY PROBABLY INSTALL THE ENGINE WITH THE WRONG FLYWHEEL OR THERE IS ANOTHER POSSIBLE CAMSHAFT GEAR THAT I MAY NOT KNOW THE CRANK AND CAM SENSORS ARE NEW OEM THE PCM WAS ALREADY REPLACED WITH THE SAME SYMPTOMS I WILL REALLY APPRECIATE ANY HELP THANKS ALL OF YOU FOR READING