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Chevy Silverado Random misfire

  

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Hi Scotty, I have a 2005 Chevy 

Silverado 4.3 V6 Code#P0300

my blue driver says it’s a random misfire so far I have changed the spark plugs and plug wires new distributor 

Purge valve  and the canister vent assembly I’m only getting about 13mpg  I sprayed carb cleaner all around the engine compartment and no noticeable change in idle speed . Please Help 

cordially, Perplexed in Pennsylvania 


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