Decided to engine swap my 05 4.7l 1500 4x4 pickup recently since the original motor has been suffering from a cracked head. Bought a 120k mile motor off of car part planet. When it came we noticed it cane out of a jeep. Had a shoterned water pump fan and diffrent oil dip stick. We swapped over all of our accessories and dropped in the motor smoothly. Not one plug didn't match up. We decided to use the throttle body and injectors that came with the motor since they had 50k less miles than the original. On the first hit of the key the truck started right up and instantly reved up to 3500 rpms. Ran smoothly but held 3500rpms and wouldn't budge. Once turning the motor off we ran the codes and got p0208. We cleared it and restrted the motor and the same thing 3500 rpm. Shut it off and decided to start checking grounds. Buffed and reinstalled main engine ground on drivers side. Went and hit the key and nothing the motor just cranks. After more diagnosis we have pressure at the rail but the ecm is not letting it spark or send in fuel. After hitting it with starting fluid it fired right up and coginued running this time starting at 3500 then dropping down to 2250 and bouncing up to 2500 continuously. Tomorrow we are going to change over the throttle body to the original one from the 1500. Was reading online that 4.7l can be iffy and that a jeep motor had some differences that our 1500 ecm isn't liking. There were no extra plugs and everything lined up perfectly. The only other diffrence we saw was the jeep motor had a ground on both sides of the block. The 1500 only has one on the driver side. Thanks for the read any help is appreciated.

 

If you're going to copy your post from another forum, you'll want to limit it to just the post itself and not the entire page LMAO.
Figure out what year your donor engine came out of.

 

Donor motor is out of a 05 dodge Dakota slt 4x4

 

so not a jeep motor