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ignition spark color

I am getting a strong yellow rather than blue spark when testing by allowing any plug wire or the coil wire to fire at an exposed metal part of the motor. I replaced the coil with no change. The engine runs well, but maybe not as well as it could. Could the old wiring harness be the problem? How can I test for the origin of the problem? Tom, owner of the same Pantera for 21 great years
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