Sounds like misfiring after driving for a while

1977 NISSAN 280Z
170,000 MILES
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SCOTTDA
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I have a 1977 280Z with orginal engine and approx 170K miles. Starts when cold, but dregrades to a misfiring sound or less than 6 cylinders after driving at freeway speeds. Must cool down before normal start up again. Sometimes this takes a day. Could this be "heat soak" on coils, airflowmeter issues, or California Gas??? Can anyone help with this probelm?
Apr 30, 2013 at 8:05 PM
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MHPAUTOS
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I would start with checking coil plugs and ignition leads, and if it still has a points ignition check that as well including the carbon brush in the dist cap.
May 1, 2013 at 2:27 AM
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SCOTTDA
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Thanks. I'll check the coil plugs and ignition leads. Its an electronic Ignition.
May 1, 2013 at 12:00 PM
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MHPAUTOS
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make sure that the dist cap is ok, no tracking marks, and let me know how you fair.
May 1, 2013 at 2:08 PM