What is your question?
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What is your question?
Changed the head a week ago set timing perfect and camshaft sensors. Cylinders 5,6,7,8 are running fine,

What are the code numbers?, It could be a random misfire. Please provide more info. Otherwise, any suggestions given could not be for your specific issue. I'll suggest to check all plugs, connectors, or anything that might look plugged but would not be seated correctly or completely.