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How many miles do you have on your 83 5MGE engine? Any aftermarket parts installed? What exhaust system are you running?
 

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Clogged or leaky fuel injectors can cause your gas mileage to drop and can also cause backfiring. :snipersm: Try checking your ignition timing first and also check the output of your 02 sensor. If both check OK then it wouldn't hurt to have your injectors cleaned.
 
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