Need help with buying new PCM

[aknight6621]

So i’m in a bit of a pickle. I have a 2005 Ram 1500 SLT with the 5.7 that i got given as a gift with a blown motor. I went through and picked up a used motor for a damn good deal and did the swap myself. However the new engine is out of an 03’ ram. It currently runs and drives but i have a p0300 code. I’ve done injectors, plugs, wires, coils and i’ve ran seagram through the intake as well as the gas tank. I spoke to a tuner shop and the guy agreed with me that all signs point to an EGR issue since the 05’ had an EGR but the 03’ is a non-EGR motor. Sadly the only way to resolve that issue is to tune the PCM aland essentially reprogram the EGR (I don’t know a thing about tuning). But the good ol’ EPA has made it illegal to tamper with emissions systems so unless i outsource to canada like he suggested then im SOL. He also brought up i can buy a new PCM and after some research, a new PCM will run me less than a tune so im leaning towards doing that. My question is, since PCM’s are vin mapped would i use the vin off the 03’ that the engine came out of? or would i use the 05’ vin. And if i need to use the 03’ vin will the new PCM coded to the 03’ vin alter any other aspect of the truck. First time doing a motor swap on my own project so any help is greatly appreciated!

 

[jws123]

You can drill the EGR port on the cylinder head the little indent should be there I have done it was not hard at all head has to be off of course. Or just swap the passenger cylinder head and intake manifold it will be cheaper and easier then trying to tune the ECM which no one will do.
Do you still have the old engine maybe pull the passenger head off see if its any good.