Help! I am having a problem with 1968 GTO 400 ignition coils. They only last a short time (less than 20 miles) before the car starts to miss and run poorly. When this happens, I can replace the coil and the car will run fine ... for a little while. Everything is stock. I think it is hooked up correctly (pos to the wiring harness and neg to the distributor). I'm pretty sure I am using the correct coil. I've bought several from NAPA, and they all have the same part number and have text specifying they are to be used with an external resistor. And I had the same kind of coil in the car for a long time with no trouble until this problem developed. Does anybody have any idea what could be causing this? Thanks, Bryan.
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