You need to turn the fuel air mixture down it is getting too much fuel go to carb manufacture and find out the number of turns for the jets on your sled
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typically these problems are caused by either fuel problems or spark problems. I would pull the sparkplugs to see if the engine is running lean or rich. Normally the spark plugs should have a nice tan color to them. If they are wet or black engine is running rich. Easier still depending on the year of your Blazer, is to have the computer scanned for codes. Usually this will tell you exactly what is wrong.
usually due to bad "needle and seats" AKA float valves in carbs on older models that do not seal properly and cause rich running conditions, hence poor fuel mileage. I also suspect the sparkplug electrodes are dark brown or black in color indicating the rich condition. they should burn a clean light tan color. A qualified technician should properly overhaul the carbs and adjust as necessary.
With the engine running try spraying a couple shots of carb spray into the throttle body. If the idle smooths out then your running lean. The next step is to check fuel pressure, vacuum leaks, and try unplugging the upstream oxygen sensor. It could be stuck rich which would make the computer drive fuel trims lean.
Probably a dead sparkplug. There can be many causes but start by checking the starter valve plungers (chokes) on the carburetors. Return springs inside the metal elbow get corroded. Rubber face of the plunger gets worn. The engine then runs with one carb in a permanent choke condition and the rich fuel mix destroys the sparkplug.
try removing and cleaning the mass air flow meter as this controls the fuel delivery if problem persists replacing the distributor might be the solution the pick up plate inside could be bad.
Car is running rich, can be a bad fuel pressure regulator or bad MAP sensor and can even be as simple as a bad vacuum hose that is disconnected. Regardless your engine is running rich (too much gas in to the engine from the fuel injectors) causing your plugs to turn black and foul, which is also causing your engine to sputter.
Start with the simple and check all your vacuum hoses, fuel pressure regulator and MAP sensor.
Good luck and keep me posted, be glad to help you get your car running 100% again soon.
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The Symptoms tell me it is a head gasket. A leaky or bad head gasket would cause all of the problems that you mentioned.
Burning water causes White Smoke, Burning Oil causes Black Smoke. The oil and water are mixing with the gas in the cylinders and causing it to run bad. Pull out the dipstick and look at the oil on it. Does it look like good oil? Or does it look watery and or foamy or grey colored. Open up the radiator and look inside, do you see oil?
This seems almost text book to me... I would have someone local to you to have a look at it to be sure.
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