my car wont hold idle when it starts up and dies this only happens the first 3 times i start it, then on the 4th or so time it can hold idle.

i just swapped my engine, so maybe i misplaced a vacuum line or harness somewhere? anyone have any idea what it might be?

the only things i think i could have made a mistake on were the harnesses that could have been switched that were in the same location with the same harness type such as under the intake manifold area and on top of the transmission.

 

If the battery was disconnected if will take a few drive cycles for the ecu to re-learn the fuel trims.

 

really, so youre suggesting that i should just drive around the block a few times? i didnt drive it around yet.

 

A drive cylce is letting the car get to operating temperature and then around 8hr cool down.