so all of the sudden i got a dead cylinder. After some checking im getting no spark of the coil pack for Cylinder number 4. My question is: Is there anything other than jsut a bad Coil Pack that would cause this. Is till have the 84-85 coil pack in there, prob the original one. I have an 86-87 ecm to evetually do the change over but money is tight right now and I would rather just get the car back running correctly. Is it ok to do the 86-87 ecm conversion w/o changing over to the 86-87 coil pack. I have heard it both ways. Anyway, any feedback or suggestions would be great. Thanks everyone.