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.
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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.