Last month I swapped a 99 accord engine into a 01 body. Now it wont start. It cranks fine but when the key is turned back to remove the key the engine acts like it fires and will kikck back every time I do this........What could the problem be?

 

4-cyl? V6? Auto or manual transmission? 4-door or 2-door?

 

4 door, 4 Cylinder, Auto.....