Need help 2003 discovery idle issue after engine change

[I am stupid]

I have a 2003 discovery, love the vehicle or at least I did. After an unfortunate oil leaking issue the engine needed to be replaced. So I got a motor and put it in. Prior to being out in we hooked everything up and the engine ran great. As soon as it went in the vehicle the problem started. Everything was hooked up and connected. It started and sounded fine until it idled down to about 750 rpm then it died. It continued to do this every time. We checked the codes and replaced those sensors with others from an identical model that runs fine. The only code it gives me now is for mass air flow. We changed the sensor so that's not the problem.

Does anyone have a suggestion on where to go from here.

 

[Disco Mike]

Sure, send me your number so we can talk and I'll walk you thru what to check/do.

 

[Disco Mike]

So, you need help, ask for help and won't reply, what is holding you up?

 

[I am stupid]

Sorry mike I've been working a ton lately and haven't had a chance to follow up. I'll sen to my number and when I should be able to call.