3.4l engine swap... flash ecm?!?

Swapped out my 5vzfe for another... got it in but no fire and the same check engine light is on that was on with the previous engine... I'm guessing flash the ecm? All advice welcome and thanks guys!

 

Did you install your harness and sensors with the engine you installed?

Just why did you replace the engine??

If the battery was disconnected during the swap all the codes will be cleared .

The question is just what code??

What is this flashing of the ECM ??

 

You cannot flash the ECM in a first gen.

 

Ill have to get back to you with the codes, i used harness that WA on the truck, had to change the top of the intake to get my MAF and throttle body to comply . Engine behaves as if 180 out of time pops tgem pops back on itself the code was a misfire on cylinder 3 .I'll be back with more info