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I have a 85 Full Size, 5.0, Ran good, then put 2 new head gaskets on and now when it warms up the thing misses real bad and seems to run on 6 cylinders. I have replaced distributor & module, coil, plugs, wires. with no improvement. It appears the computer is changing the timing as I will set it and then drive it for 10 minutes and then it is totally different. Had it at 2 shops and they have no clue! Help
