Check your tail pipe if theres a lot of exost gas wen you accelerate if not then ,
chek your catalitic converter may be pluged / damaged
Have you check fuel pressure at idle should be 29-30psi. Leave guage on and start it and press the gas peddle it should jump to 40psi if not then the fuel pump is weak or is going to fail. Does the Blazer have high mile? if so its probably the fuel pump.
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