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Discussion Starter #1
I picked up a little run around truck, 1990 Nissan d21 2.4, I've done all the major tune up items, plugs, wires, cap, rotor, sect. But I still can't get rid of a low rpm stumble, its running way to rich and blows black smoke. If you run it it won't start back cause it floods the plugs. I'm thinking mass air or o2 sensor? I'm just tired of throwing money at it, any ideas?
Thanks!
 

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Discussion Starter #3
Got it figured out, it was the coolant temperature sensor connector. Thanks!
 
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