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probably a few bad parts such as icm, o2,fuel filter,cat, ecm,fuel pump, i had the same problem on the 88 gta it ran fine and then started to back fire and sputter all it was the fuel filter was clogged , i had the same problm on my 94 blazer all it was was when the previous owener changed the fuel pump he used the alligator clips instead of the hose clamps
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