I have a 2003 ram 1500 with a 4.7 with a blown motor would it be possible to swap a 4.7 from an 08 in it and if so how much work would be required. And also my current motor reads a multi cylinder misfire and struggles to turn over and it also has a code for throttle position sensor keep in mind the radiator went out right before the motor quit on me

 

Custom tuning and you have to alter the harness and figure out how to fire the other coil (two per cylinder, might be able to rig something similar to 03-05 hemi). 08 intake manifold is set up for fly-by-wire so you will need the TB adapter plate to use your stock cable one. Using your stock intake manifold will choke down the engine (08+ manifold is the factory upgrade for engines your year), unless you don't care about that.