GMC truck. 1988 350 5.7l 2wd?

basil_ramirez1414

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well i know how to work on my cars i always have been but today i'm beat by my own truck.
it has black smoke, so i know that the air and fuel mix isn't right.
so i changed out the map sensor, o2 sensor, plugs wires, and my next step is to plug it up to my code reader but b4 i do that can any one help me with possible ideas. im getting fed up with falling short on fixing the truck its a 88 gmc 350 5.7l v8 2wd
sorry and yea just gave it a full tune up
 
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