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How do tell if the engine is running rich? I get low fuel mileage 14mpg. The engine is a V6 Vortec. Can the fuel mixture be adjusted?
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How about a tune up Distributor cap and rotor, spark plugs and air filter will make a huge difference https://repairpal.com/estimator/chevrolet/s10+blazer and locate a shop here https://repairpal.com/chevrolet-repair-in-reno-nevada
Do you get a Diagnostic Trouble Code 45? If so, you might have a fuel leak in the intake manifold if you have a VIN 'W' engine. Look inside the upper manifold cover. The fuel mixture is controlled by the ECM.