Runs rough after warm up.

Asked by Jun 10, 2017 at 08:57 AM about the GMC Sierra 1500

Question type: Maintenance & Repair

1986 GMC Sierra, 305, auto trans, carburated.  Have read all the issues other
have posted, and it acts similar to the diaphragm issue, but not injected.  
Changed fuel pump, installed inline filter, new gas, all the usual tuneup items,
still no joy.  Could it be something in the coil?

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