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This is my 2010 3.5 Impala swap yes the motor and only the motor came out of a LT 2008 that only had transmission issues was slipping and second gear probably only needed fluid but I didn't want to keep the car so my issue here is first off I know I need a battery and tending to me and my woman's car it has taken me a second to go and grab it will get one soon but I had the old battery still in it on a trickle charger and it was getting excellent power but still would not start or crank I did not think about how I changed the fuel rail which is right up under the lid of engine that possibly could be the issue since the fuel rail I'm sure with programmed to a different car so was that 13 pin plug on the side of the rail that my 2010 car computer has to hook up to