I'm new to this forum, sorry for the long post.

I have had my 06 rsx base model (bought used) for over a year now, it had a 6 speed installed by the previous owner which had problems with third gear. Couple weeks ago I finally decided to go ahead and put the stock 5 speed transmission back in.. It went well and I was about to back it out the driveway and boom.. it died and the green immobilizer key light starts flashing. So I decided my only options were to go hondata or have the ecu reflashed/ bypass the immobilizer. Long story short , neither of those things worked. Still won't start, I even ran a wire to the fuel pump and it actually started once with the reflashed ecu... then died immediately when I went to back out of the driveway and still won't start up... back to square one again...

My question is could it be a wiring problem? Or is there something I'm missing? Mechanically everything is fine.