I started with a 97' ex auto, I was dissatisfied with the performance of it so what I did was, I swapped it out for a 98 ls motor b18b. I also changed the engine harness to a manual engine harness, and everything plugs in correctly and in place, but my problem is that the engine has a problem starting, it cranks and catches sparks, then the engine shakes like crazy, rpm idles engine feels as if its going to kill out, then rpm flies up to 2000 and then slowly idles to normal. Please help I don't know what to do.