when i got this engine, it was a complete running engine with 130 K on it, and i have the EFI unit, all hoses, even the wiring harness INTACT (underdash and underhood) from the tracker, but there was no computer or place to plug one into the harness. it's bad enough i have a computer at home, i don't want one on my car. when they work right, they are great. and when they don't, you kick yourself in the ass for not staying with something mechanical you can tinker and fudge with and you know you will have it running again.