Hello All,

I have replaced the spark plugs to tune up the car and decided to replace the coil since it is the original one after 93k. Well bought new coil but it won't start the car, however, when I put the old one back the car starts!! Bought a new ACDelco coil and still won't start but again the old one starts. I would really like to replace the old one since it is due for replacement but where is the issue? why the new coil won't work but the old one work? Do I have to reset anything? I thought it is pretty straight forward replacement!!!
Thanks