S10 Blazer Running Rich

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.