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New 4.2 v6 problems

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Old 07-27-2014, 12:43 PM   #1
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Default New 4.2 v6 problems

Put new motor in , went to start and it has backfiring through the exaust. Does any one know how I can resolve this?
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Old 07-27-2014, 07:19 PM   #2
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Plug wires are on it wrong or timing chain installed incorrectly.
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Old 07-27-2014, 07:19 PM   #3
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Could be Mass airflow sensor also make sure it's plugged in.
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Old 07-27-2014, 07:19 PM
 
 
 
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